Inbox Placement

A seed list is an object that provides the mailing list for your inbox placement test. It also acts as a container for all the results of those tests and will aggregate the stats of all the tests.

When you create a seed list you will be provided a mailing list. You may adjust this mailing list as you see fit, but you must send to the target_email otherwise a placement test will not be run.

Generate a seed list

POST /v4/inbox/seedlists

Generate a seed list. The available form fields are as follows:

Field	Description
sending_domains	The sending domains that messages will come from. You may specify this multiple times. At least one is required.
name	The name that you would like to use for this seed list.
seed_filter	A regular expression that will be applied to addresses in the mailing list.

curl -X POST https://api.mailgun.net/v4/inbox/seedlists \
  -F 'sending_domains=domain.com' \
  --user 'api:<YOUR_API_KEY>'

   import com.mailgun.api.v4.MailgunSeedListApi;
   import com.mailgun.client.MailgunClient;
   import com.mailgun.model.seedlist.SeedListItem;
   import com.mailgun.model.seedlist.SeedListRequest;
   import java.util.List;

   // ...

   public SeedListItem createSeedList() {
       MailgunSeedListApi mailgunSeedListApi = MailgunClient.config(API_KEY)
               .createApi(MailgunSeedListApi.class);

       SeedListRequest request = SeedListRequest.builder()
               .seedFilter(SEED_FILTER)
               .name(SEED_LIST_NAME)
               .sendingDomains(List.of(TEST_DOMAIN_1, TEST_DOMAIN_2))
               .build();

       return mailgunSeedListApi.generateSeedList(request);
   }
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function create_seed_list() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/seedlists');
  curl_setopt($ch, CURLOPT_POSTFIELDS, array(
      'sending_domains'=> 'domain.com',
      )
  );

  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def create_seed_list():
    data = {'sending_domains': 'domain.com'}
    return requests.post(
        "https://api.mailgun.net/v4/inbox/seedlists", data=data
        auth=('api', 'YOUR_API_KEY'))

def create_seed_list
  data = {'sending_domains'=> 'domain.com' }
  RestClient.post("https://api:YOUR_API_KEY" \
                  "@api.mailgun.net/v4/inbox/seedlists",
                  fields_hash.merge(data))
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class CreateInboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (CreateSeedList ().Content.ToString ());
    }

    public static IRestResponse CreateSeedList ()
    {
        RestClient client = new RestClient ();
        client.BaseUrl = new Uri ("https://api.mailgun.net/seedlists");
        client.Authenticator =
            new HttpBasicAuthenticator ("api", "YOUR_API_KEY");
        RestRequest request = new RestRequest ();
        request.AddParameter ("sending_domains", "YOUR_DOMAIN_NAME", ParameterType.UrlSegment);
        request.Resource = "inbox/seedlists";
        request.Method = Method.POST;
        return client.Execute (request);
    }
}

Example response for creating a seed list.

{
  "kid": "610abd2009b08f382ac86c45",
  "created_at": "2021-08-04T16:15:28.08Z",
  "updated_at": "2021-08-04T16:15:28.08Z",
  "last_result_at": "0001-01-01T00:00:00Z",
  "target_email": "ibp-12345678-1234-1234-1234-123456789012@domain.com",
  "sending_domains": [
    "yourdomain.com"
  ],
  "has_results": false,
  "name": "My campaign inbox test",
  "seed_filter": ".*",
  "mailing_list": "ibp-12345678-1234-1234-1234-123456789012@domain.com,another@email.com",
  "delivery_stats": {
    "all": {
      "delivered": 0,
      "missing": 0,
      "pending": 0,
      "spam": 0,
      "inbox": 0,
      "total": 0,
      "provider": "all"
    }
  },
  "results": []
}

Field Explanation:

Name	Type	Description
kid	string	Unique identifier for a seed list.
created_at	datetime	Date and time that seed list was created.
updated_at	datetime	Date and time that seed list was updated. Will update whenever it is changed.
last_result_at	datetime	Date and time that seed list was updated. Will update whenever a new result comes in.
target_email	string	The required email address that must be included in a mailing list for an inbox placement test to work.
sending_domains	array	The list of possible domains that the messages must come from.
has_results	bool	A flag that is true when results exist for this seed list
name	string	The name of the seed list
seed_filter	string	A regular expression value that will be used to filter the list of seeds in the seed list.
mailing_list	string	A mailing list that contains the target email, and available seeds.
delivery_stats	object	An object that contains sub-objects that describe delivery stats. See below.
results	array	An array of results from the seed list’s tests.

Delivery Stats

Delivery stats is an object that is included with seed list and results from the API. It is an attribute of the main object that is returned. A sample object:

 "delivery_stats": {
  "all": {
    "delivered": 10,
    "missing": 1,
    "pending": 0,
    "spam": 3,
    "inbox": 6,
    "total": 10,
    "provider": "all"
  },
  "yahoo.com": {
    "delivered": 4,
    "missing": 1,
    "pending": 0,
    "spam": 0,
    "inbox": 4,
    "total": 5,
    "provider": "yahoo.com"
  },
  "gmail.com": {
    "delivered": 5,
    "missing": 0,
    "pending": 0,
    "spam": 3,
    "inbox": 2,
    "total": 5,
    "provider": "gmail.com"
  }
}

Field Explanation:

Name	Type	Description
sub-object -“subkey”	object	The sub-object of the main delivery_stats object is divided by provider. There will always be an “all” provider that is the total sum.
delivered	number	The amount of messages that were received by the system.
missing	number	The amount of messages that were not received by the required reporting time period.
pending	number	The amount of messages that have yet to be received within the required reporting time period.
spam	number	The amount of messages that were detected in the provider’s spam folder.
inbox	number	The amount of messages that were detected in a non-spam folder.
total	number	The amount of messages that are expected.
provider	string	The provider that these mailboxes are a part of (identical to key).

Results

A result is an object summarizing Inbox Placement tests sent to the target_email.

{
  "result_id": "12345678-1234-1234-1234-123456789012",
  "subject": "IBP Test - 1",
  "sender": "generated@yourdomain.com",
  "delivery_stats": {
    "all": {
      "delivered": 7,
      "missing": 0,
      "pending": 0,
      "spam": 2,
      "inbox": 5,
      "total": 7,
      "provider": "all",
      "categories": {}
    }
  }
}

Field Explanation:

Name	Type	Description
result_id	string	Unique identifier for a received test.
subject	string	The subject of the email sent to the target_email.
sender	string	Sender address of the email sent to the target_email.
delivery_stats	object	An object that contains sub-objects that describe delivery stats. See above.

Get all seed lists

GET /v4/inbox/seedlists

Get a list of all of your seed lists. You can filter this using the available filters. These can be listed from the “Get all available filters for seed lists” endpoint described below.

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/seedlists

import com.mailgun.api.v4.MailgunSeedListApi;
import com.mailgun.client.MailgunClient;
import com.mailgun.model.seedlist.SeedListsPageRequest;
import com.mailgun.model.seedlist.SeedListsResponse;

// ...

public SeedListsResponse getSeedLists() {
    MailgunSeedListApi mailgunSeedListApi = MailgunClient.config(API_KEY)
            .createApi(MailgunSeedListApi.class);

    SeedListsPageRequest filter = SeedListsPageRequest.builder()
            .limit(2)
            .offset(1)
            .ascending(false)
            .build();

    return mailgunSeedListApi.getAllSeedLists(filter);
}

# Currently, the PHP SDK does not support the Inbox Placement endpoint.
# Consider using the following php curl function.
function get_seed_lists() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/seedlists');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_seed_lists():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/seedlists",
        auth=('api', 'YOUR_API_KEY'))

def get_seed_lists
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/seedlists"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTests
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetSeedLists ().Content.ToString ());
    }

    public static IRestResponse GetSeedLists ()
    {
        RestClient client = new RestClient ();
        client.BaseUrl = new Uri ("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator ("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest ();
        request.Resource = "/inbox/seedlists";
        return client.Execute (request);
    }

}

Example response for listing seed lists.

{
  "items": [
    {
      "kid": "123456789123456789123456",
      "created_at": "2021-08-02T23:10:17.915Z",
      "updated_at": "2021-08-03T17:26:55.629Z",
      "last_result_at": "2021-08-03T17:26:55.629Z",
      "target_email": "ibp-12345678-1234-1234-1234-123456789012@domain.com",
      "sending_domains": [
        "mydomain.com"
      ],
      "has_results": true,
      "name": "Inbox Placement Test",
      "seed_filter": ".*",
      "mailing_list": "ibp-12345678-1234-1234-1234-123456789012@domain.com,some@where.com",
      "delivery_stats": {
        "all": {
          "delivered": 7,
          "missing": 0,
          "pending": 0,
          "spam": 2,
          "inbox": 5,
          "total": 7,
          "provider": "all"
        }
      },
      "results": [
        {
          "result_id": "12345678-1234-1234-1234-123456789012",
          "subject": "IBP Test - 1",
          "sender": "generated@yourdomain.com",
          "delivery_stats": {
            "all": {
              "delivered": 7,
              "missing": 0,
              "pending": 0,
              "spam": 2,
              "inbox": 5,
              "total": 7,
              "provider": "all",
              "categories": {}
            }
          }
        }
      ]
    }
  ],
  "paging": {
    "first": "http://domain.com/v4/inbox/seedlists?ascending=0&limit=1",
    "last": "http://domain.com/v4/inbox/seedlists?ascending=1&limit=1",
    "next": "http://domain.com/v4/inbox/seedlists?ascending=0&cursor=123987123981723987873497&limit=1",
    "previous": "http://domain.com/v4/inbox/seedlists?ascending=1&cursor=123987123981723987873487&limit=1"
  },
  "total": 32
}

Field Explanation:

Name	Type	Description
items	array	A list of seed list objects (same fields as above).
paging	object	A paging sub-object to navigate through sections of data.
total	number	The total amount of seed lists.

Paging sub-object

The paging sub-object assists with navigating paginated responses. For a variety of reasons the number of items that can be returned in a response has been limited. This object contains the following fields:

Name	Type	Description
first	url	A url address to the first item of this set
last	url	A url address to the last item of this set
next	url	A url address to the next item of this set
previous	url	A url address to the previous item of this set

Additionally you can interact with the pagination through a few fields added to the query-string of your request:

Name	Type	Description
limit	number	A limit on the number of items that can be returned (defaults to 25)
offset	number	A the amount of items to “move” by
ascending	bool	A flag that will set the order of the pagination
cursor	string	A unique id that can be used as a “pivot” of where you are in the set
sort	string	The parameter to sort by (EXPERIMENTAL)

Note: cursor and offset may not both be used at the same time

Get a seed list

You can select a single seed list with this endpoint.

GET /v4/inbox/seedlists/ibp-seedlist-address@domain.net

curl -X POST https://api.mailgun.net/v3/inbox/tests \
  -F 'domain=domain.com' \
  -F 'subject=testSubject' \
  -F 'from=user@sending_domain.com' \
  --form-string html='<html>HTML version of the body</html>' \
  --user 'api:<YOUR_API_KEY'>'

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class MGSample {

    // ...

    public static JsonNode validateMailingList() throws UnirestException {

        HttpResponse <JsonNode> request = Unirest.post("https://api.mailgun.net/v3/inbox/tests")
            .basicAuth("api", API_KEY)
            .field("domain", "domain.com")
            .field("subject", "testSubject")
            .field("from", "user@sending_domain.com")
            .field("html", "<html>HTML version of the body</html>")
            .asJson();

        return request.getBody();
    }
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function create_inbox_placement_test() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v3/inbox/tests');
  curl_setopt($ch, CURLOPT_POSTFIELDS, array(
      'domain'=> 'domain.com',
      'from'=> 'user@sending_domain.com',
      'subject'=>'testSubject',
      'html'=>'<html>HTML version of the body</html>',
      )
  );

  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def create_inbox_placement_test():
    data = {'domain': 'domain.com',
            'from': 'user@sending_domain.com',
            'subject': 'testSubject',
            'html': '<html>HTML version of the body</html>' }
    return requests.post(
        "https://api.mailgun.net/v3/inbox/tests",
        data=json.dumps(data),
        auth=('api', 'YOUR_API_KEY'))

def validate_mailing_list
  data = {'domain'=> 'domain.com',
          'from'=> 'user@sending_domain.com',
          'subject'=> 'testSubject',
          'html'=> '<html>HTML version of the body</html>' }
  RestClient.post("https://api:YOUR_API_KEY" \
                  "@api.mailgun.net/v3/inbox/tests",
                  fields_hash.merge(data))
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class CreateInboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (StartInboxPlacementTest ().Content.ToString ());
    }

    public static IRestResponse StartInboxPlacementTest ()
    {
        RestClient client = new RestClient ();
        client.BaseUrl = new Uri ("https://api.mailgun.net/v3");
        client.Authenticator =
            new HttpBasicAuthenticator ("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest ();
        request.AddParameter ("domain", "YOUR_DOMAIN_NAME", ParameterType.UrlSegment);
        request.Resource = "inbox/tests";
        request.AddParameter ("from", "user@sending_domain.com'");
        request.AddParameter ("domain", "domain.com");
        request.AddParameter ("subject", "testSubject");
        request.AddParameter ("html", "<html>HTML version of the body</html>");
        request.Method = Method.POST;
        return client.Execute (request);
    }
}

Example response of getting a single seed list.

{
  "kid": "610abd2009b08f382ac86c45",
  "created_at": "2021-08-04T16:15:28.08Z",
  "updated_at": "2021-08-04T16:15:28.08Z",
  "last_result_at": "0001-01-01T00:00:00Z",
  "target_email": "ibp-seedlist-address@domain.net",
  "sending_domains": [
    "yourdomain.com"
  ],
  "has_results": false,
  "name": "My campaign inbox test",
  "seed_filter": ".*",
  "mailing_list": "ibp-seedlist-address@domain.net,another@email.com",
  "delivery_stats": {
    "all": {
      "delivered": 0,
      "missing": 0,
      "pending": 0,
      "spam": 0,
      "inbox": 0,
      "total": 0,
      "provider": "all"
    }
  },
  "results": [
    {
      "result_id": "12345678-1234-1234-1234-123456789012",
      "subject": "IBP Test - 1",
      "sender": "generated@yourdomain.com",
      "delivery_stats": {
        "all": {
          "delivered": 7,
          "missing": 0,
          "pending": 0,
          "spam": 2,
          "inbox": 5,
          "total": 7,
          "provider": "all",
          "categories": {}
        }
      }
    }
  ]
}

Name	Type	Description
kid	string	Unique identifier for a seed list.
created_at	datetime	Date and time that seed list was created.
updated_at	datetime	Date and time that seed list was updated. Will update whenever it is changed.
last_result_at	datetime	Date and time that seed list was updated. Will update whenever a new result comes in.
target_email	string	The required email address that must be included in a mailing list for an inbox placement test to work.
sending_domains	array	The list of possible domains that the messages must come from.
has_results	bool	A flag that is true when results exist for this seed list
name	string	The name of the seed list
seed_filter	string	A regular expression value that will be used to filter the list of seeds in the seed list.
mailing_list	string	A mailing list that contains the target email, and available seeds.
delivery_stats	object	An object that contains sub-objects that describe delivery stats. See below.
results	array	An array of results from the seed list’s tests.

Get all iterable attributes of seed lists

You can use this endpoint to find all attributes that are available for listing values of.

GET /v4/inbox/seedlists/a

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/inbox/seedlists/a

import com.mailgun.api.v4.MailgunSeedListApi;
import com.mailgun.client.MailgunClient;
import com.mailgun.model.seedlist.SeedListsAttributesResponse;

// ...

public SeedListsAttributesResponse getSeedListAttributes() {
    MailgunSeedListApi mailgunSeedListApi = MailgunClient.config(API_KEY)
            .createApi(MailgunSeedListApi.class);

    return mailgunSeedListApi.getSeedListsAttributes();
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function get_seed_list_attributes() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/seedlists/a');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_seed_list_attributes():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/seedlists/a",
        auth=('api', 'YOUR_API_KEY'))

def get_seed_list_attributes
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/seedlists/a"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetSeedListAttributes().Content.ToString());
    }

    public static IRestResponse GetSeedListAttributes()
    {
        RestClient client = new RestClient();
        client.BaseUrl = new Uri("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest();
        request.Resource = "/inbox/seedlists/a";
        return client.Execute(request);
    }

}

Example response of seed list attributes.

{
 "items": {
   "attribute": "available attributes",
   "values": [
     "name"
   ]
 }
}

Name	Type	Description
attribute	string	A string describing what was selected.
values	array	A list of attributes that can be retrieved from the API.

Get all values of a specific attribute of your seed lists

You can use this endpoint to find all the values for a particular attribute. This can be used to produce autocomplete or suggestions from a frontend.

GET /v4/inbox/seedlists/a/attribute

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/inbox/seedlists/a/ATTRIBUTE

import com.mailgun.api.v4.MailgunSeedListApi;
import com.mailgun.client.MailgunClient;
import com.mailgun.model.seedlist.SeedListsAttributesResponse;

// ...

public SeedListsAttributesResponse getSeedListAttribute() {
    MailgunSeedListApi mailgunSeedListApi = MailgunClient.config(API_KEY)
            .createApi(MailgunSeedListApi.class);

    return mailgunSeedListApi.getSeedListsAttribute(ATTRIBUTE_NAME);
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function get_seed_list_attribute() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/seedlists/a/ATTRIBUTE');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_seed_list_attribute():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/seedlists/a/ATTRIBUTE",
        auth=('api', 'YOUR_API_KEY'))

def get_seed_list_attribute
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/seedlists/a/ATTRIBUTE"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetSeedListAttribute().Content.ToString());
    }

    public static IRestResponse GetSeedListAttribute()
    {
        RestClient client = new RestClient();
        client.BaseUrl = new Uri("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest();
        request.AddParameter ("attribute", "ATTRIBUTE", ParameterType.UrlSegment);
        request.Resource = "/inbox/seedlists/a/{attribute}";
        return client.Execute(request);
    }

}

Example response of seed list attribute values.

{
 "items": {
   "attribute": "name",
   "values": [
     "Inbox Placement Test",
     "My email campaign"
   ]
 }
}

Name	Type	Description
attribute	string	A string describing what was selected.
values	array	A list of attributes that can be retrieved from the API.

Get all available filters for seed lists

You can use this endpoint to list the available filters for seed lists.

GET /v4/inbox/seedlists/_filters

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/inbox/seedlists/_filters

import com.mailgun.api.v4.MailgunSeedListApi;
import com.mailgun.client.MailgunClient;
import com.mailgun.model.seedlist.SeedListsFiltersResponse;

// ...

public SeedListsFiltersResponse getSeedListFilters() {
    MailgunSeedListApi mailgunSeedListApi = MailgunClient.config(API_KEY)
            .createApi(MailgunSeedListApi.class);

    return mailgunSeedListApi.getSeedListFilters();
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function get_seed_list_filters() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/seedlists/_filters');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_seed_list_filters():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/seedlists/_filters",
        auth=('api', 'YOUR_API_KEY'))

def get_seed_list_filters
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/seedlists/_filters"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetSeedListFilters().Content.ToString());
    }

    public static IRestResponse GetSeedListFilters()
    {
        RestClient client = new RestClient();
        client.BaseUrl = new Uri("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest();
        request.Resource = "/inbox/seedlists/_filters";
        return client.Execute(request);
    }

}

Example response of seed list filters.

{
 "supported_filters": {
   "filters": [
     {
       "parameter": "name",
       "description": "Get seedlists by name"
     },
     {
       "parameter": "time_before",
       "description": "Get seedlists before date"
     },
     {
       "parameter": "time_after",
       "description": "Get seedlists after date"
     }
   ]
 }
}

Name	Type	Description
parameter	string	The key of the parameter you can pass in your query string.
description	string	A description of the filter

Delete a seed list

You can delete a seed list with this endpoint. The results under it will not be kept.

DELETE /v4/inbox/seedlists/ibp-seedlist-address@domain.net

curl -s --user 'api:YOUR_API_KEY' -X DELETE -G \
    https://api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL

import com.mailgun.api.v4.MailgunSeedListApi;
import com.mailgun.client.MailgunClient;
import feign.Response;

// ...

public Response deleteInboxPlacementTest() {
    MailgunSeedListApi mailgunSeedListApi = MailgunClient.config(API_KEY)
            .createApi(MailgunSeedListApi.class);

    return mailgunSeedListApi.deleteSeedListFeignResponse(TARGET_EMAIL);
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function delete_inbox_placement_test() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def delete_inbox_placement_test():
    return requests.delete(
        "https://api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL",
        auth=('api', 'YOUR_API_KEY'))

def delete_inbox_placement_test
  RestClient.delete("https://api:YOUR_API_KEY"\
                    "@api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL"\
                    {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetInboxPlacementTest().Content.ToString());
    }

    public static IRestResponse DeleteInboxPlacementTest()
    {
        RestClient client = new RestClient();
        client.BaseUrl = new Uri("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest(Method.DELETE);
        request.AddParameter ("target_email", "TARGET_EMAIL", ParameterType.UrlSegment);
        request.Resource = "/inbox/seedlists/{target_email}";
        return client.Execute(request);
    }

}

This does not return any value.

Update a seed list

You can update a seed list with this endpoint. Modifying the sending domains or the seed filter will not affect historical results.

PUT /v4/inbox/seedlists/ibp-seedlist-address@domain.net

Update a seed list. The available form fields are as follows:

Field	Description
sending_domains	Update the sending domains of the seed list. You can specify this multiple times.
name	Update the name of the seed list.
seed_filter	Update the regular expression that will be applied to addresses in the mailing list.

curl -X PUT https://api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL \
  -F 'sending_domains=domain.com' \
  --user 'api:<YOUR_API_KEY>'

import com.mailgun.api.v4.MailgunSeedListApi;
import com.mailgun.client.MailgunClient;
import com.mailgun.model.seedlist.SeedListItem;
import com.mailgun.model.seedlist.SeedListRequest;
import java.util.List;

// ...

public SeedListItem updateSeedList() {
    MailgunSeedListApi mailgunSeedListApi = MailgunClient.config(API_KEY)
            .createApi(MailgunSeedListApi.class);

    SeedListRequest request = SeedListRequest.builder()
            .seedFilter(SEED_FILTER)
            .name(SEED_LIST_NAME)
            .sendingDomains(List.of(TEST_DOMAIN_1, TEST_DOMAIN_2))
            .build();

    return mailgunSeedListApi.updateSeedList(TARGET_EMAIL, request);
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function create_seed_list() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL');
  curl_setopt($ch, CURLOPT_POSTFIELDS, array(
      'sending_domains'=> 'domain.com',
      )
  );

  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def create_seed_list():
    data = {'sending_domains': 'domain.com'}
    return requests.put(
        "https://api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL", data=data
        auth=('api', 'YOUR_API_KEY'))

def create_seed_list
  data = {'sending_domains'=> 'domain.com' }
  RestClient.put("https://api:YOUR_API_KEY" \
                  "@api.mailgun.net/v4/inbox/seedlists/TARGET_EMAIL",
                  fields_hash.merge(data))
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class CreateInboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (CreateSeedList ().Content.ToString ());
    }

    public static IRestResponse CreateSeedList ()
    {
        RestClient client = new RestClient ();
        client.BaseUrl = new Uri ("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator ("api", "YOUR_API_KEY");
        RestRequest request = new RestRequest ();
        request.AddParameter ("sending_domains", "YOUR_DOMAIN_NAME", ParameterType.UrlSegment);
        request.Resource = "inbox/seedlists/TARGET_EMAIL";
        request.Method = Method.PUT;
        return client.Execute (request);
    }
}

{
  "kid": "610abd2009b08f382ac86c45",
  "created_at": "2021-08-04T16:15:28.08Z",
  "updated_at": "2021-08-04T16:15:28.08Z",
  "last_result_at": "0001-01-01T00:00:00Z",
  "target_email": "ibp-seedlist-address@domain.net",
  "sending_domains": [
    "yourdomain.com"
  ],
  "has_results": false,
  "name": "My campaign inbox test",
  "seed_filter": ".*",
  "mailing_list": "ibp-seedlist-address@domain.net,another@email.com",
  "delivery_stats": {
    "all": {
      "delivered": 0,
      "missing": 0,
      "pending": 0,
      "spam": 0,
      "inbox": 0,
      "total": 0,
      "provider": "all"
    }
  },
  "results": []
}

Name	Type	Description
kid	string	Unique identifier for a seed list.
created_at	datetime	Date and time that seed list was created.
updated_at	datetime	Date and time that seed list was updated. Will update whenever it is changed.
last_result_at	datetime	Date and time that seed list was updated. Will update whenever a new result comes in.
target_email	string	The required email address that must be included in a mailing list for an inbox placement test to work.
sending_domains	array	The list of possible domains that the messages must come from.
has_results	bool	A flag that is true when results exist for this seed list
name	string	The name of the seed list
seed_filter	string	A regular expression value that will be used to filter the list of seeds in the seed list.
mailing_list	string	A mailing list that contains the target email, and available seeds.
delivery_stats	object	An object that contains sub-objects that describe delivery stats. See below.
results	array	An array of results from the seed list’s tests.

List Results

Test results are generated when a message has been received at the target_email. If a message is not received at the target email no seed test will be run. Results will contain the status of the monitored mail boxes and will provide stats of the test.

GET /v4/inbox/results

List all results for your account.

Field	Description
rid	Update the sending domains of the seed list. You can specify this multiple times.
name	Update the name of the seed list.
seed_filter	Update the regular expression that will be applied to addresses in the mailing list.

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/inbox/results

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class MGSample {

    // ...

    public static JsonNode getResults() throws UnirestException {

        HttpResponse<JsonNode> request = Unirest.get("https://api.mailgun.net/v4/inbox/results")
            .basicAuth("api", API_KEY)
            .asJson();

        return request.getBody();
    }
}

# Currently, the PHP SDK does not support the Inbox Placement endpoint.
# Consider using the following php curl function.
function get_results() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/results');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_results():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/results",
        auth=('api', 'YOUR_API_KEY'))

def get_results
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/results"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTests
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetResults ().Content.ToString ());
    }

    public static IRestResponse GetResults ()
    {
        RestClient client = new RestClient ();
        client.BaseUrl = new Uri ("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator ("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest ();
        request.Resource = "/inbox/results";
        return client.Execute (request);
    }

}

{
 "items": [
   {
     "rid": "123456789012345678901234",
     "result_id": "12345678-1234-1234-1234-123456789012",
     "keybox_email": "ibp-00410325-1c95-492e-bc35-c19899802494@mailgun.net",
     "subject": "A subject of things",
     "sender": "person@domain.com",
     "name": "Such list",
     "created_at": "2021-08-03T14:20:40.301Z",
     "updated_at": "2021-08-03T14:36:53.841Z",
     "seed_results": [
       {
         "email": "mail@box.com",
         "provider": "box.com",
         "destination": "inbox",
         "state": "delivered",
         "originating_ip": "123.123.123.123",
         "tags": [
           "inbox"
         ],
         "spf": "pass",
         "dkim": "pass",
         "dmarc": "pass"
       }
     ]
   }
 ]
 }

Name	Type	Description
rid	string	Unique identifier for a results.
keybox_email	string	The target email of the seed list associated with this result.
subject	string	The subject of the email received by the seed list mailbox (target_email)
sender	string	The email address of the sender received by the seed list mailbox (target_email). All other results must come from the same sender.
name	string	The name of the seed list.
created_at	datetime	Date and time that the results were created.
updated_at	datetime	Date and time that the results were updated. Will update whenever a mailbox within the test receives mail.
seed_results	object	A sub-object that contains the status of each individual seed mailbox.
status	string	Will show “processing” or “complete”.
delivery_stats	object	A sub-object that provides the stats of this result.

Seed Results

The seed results sub-object will provide the details of the individual seed mail boxes.

Field Explanation:

Name	Type	Description
email	string	The email address of the mailbox.
provider	string	The email provider of the mailbox (usually the domain).
destination	string	Either “inbox” or “spam”
state	string	Whether or not the mailbox has received a message
originating_ip	string	The IP address from which the message came from (if available)
tags	array	The folder, or labels of where the message ended up.
spf	string	SPF email authentication results (if available). Possible values are “pass”, “fail”, and “missing/not-set”.
dkim	string	Results from DKIM evaluation (if available). Possible values are “pass”, “fail”, and “missing/not-set”.
dmarc	string	DMARC email authentication results (if available). Possible values are “pass”, “fail”, and “missing/not-set”.

Get Available Result Filters

GET /v4/inbox/results/_filters

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/results/_filters

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class MGSample {

    // ...

    public static JsonNode getResultsFilters() throws UnirestException {

        HttpResponse<JsonNode> request = Unirest.get("https://api.mailgun.net/v4/inbox/results/_filters")
            .basicAuth("api", API_KEY)
            .asJson();

        return request.getBody();
    }
}

# Currently, the PHP SDK does not support the Inbox Placement endpoint.
# Consider using the following php curl function.
function get_results_filters() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/results/_filters');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_results_filters():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/results/_filters",
        auth=('api', 'YOUR_API_KEY'))

def get_results_filters
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/results/_filters"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTests
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetResultsFilters ().Content.ToString ());
    }

    public static IRestResponse GetResultsFilters ()
    {
        RestClient client = new RestClient ();
        client.BaseUrl = new Uri ("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator ("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest ();
        request.Resource = "/inbox/results/_filters";
        return client.Execute (request);
    }

}

Example response of getting the available results filters.

{
  "supported_filters": {
    "filters": [
      {
        "parameter": "senderaddr",
        "description": "Sender address"
      },
      {
        "parameter": "subject",
        "description": "Subject line"
      },
      {
        "parameter": "provider",
        "description": "E-mail provider"
      },
      {
        "parameter": "target_email",
        "description": "Seedlist target e-mail"
      },
      {
        "parameter": "time_before",
        "description": "Get results before date"
      },
      {
        "parameter": "time_after",
        "description": "Get results after date"
      }
    ]
  }
}

Get all iterable attributes of results

GET /v4/inbox/results/a

Example response of getting the result attributes.

{
  "items": {
    "attribute": "available attributes",
    "values": [
      "subject",
      "sender"
    ]
  }
}

Get all values of a specific attribute of your results lists

GET /v4/inbox/results/a/attribute

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/inbox/results/a/ATTRIBUTE

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class MGSample {

    // ...

    public static JsonNode getResultsAttribute() throws UnirestException {

        HttpResponse<JsonNode> request = Unirest.get("https://api.mailgun.net/v4/inbox/results/a/ATTRIBUTE")
            .basicAuth("api", API_KEY)
            .asJson();

        return request.getBody();
    }
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function get_results_attribute() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/results/a/ATTRIBUTE');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_results_attribute():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/results/a/ATTRIBUTE",
        auth=('api', 'YOUR_API_KEY'))

def get_results_attribute
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/results/a/ATTRIBUTE"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetResultsAttribute().Content.ToString());
    }

    public static IRestResponse GetResultsAttribute()
    {
        RestClient client = new RestClient();
        client.BaseUrl = new Uri("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest();
        request.AddParameter ("attribute", "ATTRIBUTE", ParameterType.UrlSegment);
        request.Resource = "/inbox/results/a/{attribute}";
        return client.Execute(request);
    }

}

You can use this endpoint to find all the values for a particular attribute. This can be used to produce autocomplete or suggestions from a frontend.

Example response of response attribute values.

{
  "items": {
    "attribute": "subject",
    "values": [
      "This is a subject",
      "We've been trying to contact you",
      "about your car's extended warranty"
    ]
  }
}

Get a specific result

GET /v4/inbox/results/UUID

curl -s --user 'api:YOUR_API_KEY' -G \
    https://api.mailgun.net/v4/inbox/results/UUID

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class MGSample {

    // ...

    public static JsonNode getResults() throws UnirestException {

        HttpResponse<JsonNode> request = Unirest.get("https://api.mailgun.net/v4/inbox/results/{UUID}")
            .basicAuth("api", API_KEY)
            .asJson();

        return request.getBody();
    }
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function get_results() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/results/UUID');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def get_results():
    return requests.get(
        "https://api.mailgun.net/v4/inbox/results/UUID",
        auth=('api', 'YOUR_API_KEY'))

def get_results
  RestClient.get("https://api:YOUR_API_KEY"\
                 "@api.mailgun.net/v4/inbox/results/UUID"\
                 {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class InboxPlacementTest
{

    public static void Main (string[] args)
    {
        Console.WriteLine (GetResult().Content.ToString());
    }

    public static IRestResponse GetResult()
    {
        RestClient client = new RestClient();
        client.BaseUrl = new Uri("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest();
        request.AddParameter ("uuid", "UUID", ParameterType.UrlSegment);
        request.Resource = "/inbox/results/{uuid}";
        return client.Execute(request);
    }

}

You can use this endpoint to get a single result.

Name	Type	Description
rid	string	Unique identifier for a results.
keybox_email	string	The target email of the seed list associated with this result.
subject	string	The subject of the email received by the seed list mailbox (target_email)
sender	string	The email address of the sender received by the seed list mailbox (target_email). All other results must come from the same sender.
name	string	The name of the seed list.
created_at	datetime	Date and time that the results were created.
updated_at	datetime	Date and time that the results were updated. Will update whenever a mailbox within the test receives mail.
seed_results	object	A sub-object that contains the status of each individual seed mailbox.
status	string	Will show “processing” or “complete”.
delivery_stats	object	A sub-object that provides the stats of this result.

{
 "result": {
   "rid": "123456789012345678901234",
   "result_id": "12345678-1234-1234-1234-123456789012",
   "keybox_email": "ibp-00410325-1c95-492e-bc35-c19899802494@mailgun.net",
   "subject": "A subject of things",
   "sender": "person@domain.com",
   "name": "Such list",
   "created_at": "2021-08-03T14:20:40.301Z",
   "updated_at": "2021-08-03T14:36:53.841Z",
   "seed_results": [
     {
       "email": "mail@box.com",
       "provider": "box.com",
       "destination": "inbox",
       "state": "delivered",
       "originating_ip": "123.123.123.123",
       "tags": [
         "inbox"
       ],
       "spf": "pass",
       "dkim": "pass",
       "dmarc": "pass"
     }
   ]
 }
}

Delete results

Use this endpoint to delete a result.

DELETE /v4/inbox/results/UUID

curl -s --user 'api:YOUR_API_KEY' -X DELETE -G \
    https://api.mailgun.net/v4/inbox/results/UUID

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class MGSample {

    // ...

    public static JsonNode deleteResults() throws UnirestException {

        HttpResponse<JsonNode> request = Unirest.delete("https://api.mailgun.net/v4/inbox/results/{UUID}")
            .basicAuth("api", API_KEY)
            .asJson();

        return request.getBody();
    }
}

# Currently, the PHP SDK does not support the inbox placement endpoint.
# Consider using the following php curl function.
function delete_results() {
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, 'api:PRIVATE_API_KEY');
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
  curl_setopt($ch, CURLOPT_URL, 'https://api.mailgun.net/v4/inbox/results/UUID');
  $result = curl_exec($ch);
  curl_close($ch);

  return $result;
}

def delete_results():
    return requests.delete(
        "https://api.mailgun.net/v4/inbox/results/UUID",
        auth=('api', 'YOUR_API_KEY'))

def delete_results
  RestClient.delete("https://api:YOUR_API_KEY"\
                    "@api.mailgun.net/v4/inbox/results/UUID"\
                    {|response, request, result| response }
end

using System;
using System.IO;
using RestSharp;
using RestSharp.Authenticators;

public class Results
{

    public static void Main (string[] args)
    {
        Console.WriteLine (DeleteResults().Content.ToString());
    }

    public static IRestResponse DeleteResults()
    {
        RestClient client = new RestClient();
        client.BaseUrl = new Uri("https://api.mailgun.net/v4");
        client.Authenticator =
            new HttpBasicAuthenticator("api",
                                        "YOUR_API_KEY");
        RestRequest request = new RestRequest(Method.DELETE);
        request.AddParameter ("uuid", "UUID", ParameterType.UrlSegment);
        request.Resource = "/inbox/results/{uuid}";
        return client.Execute(request);
    }

}

This does not return any value.