> For the complete documentation index, see [llms.txt](https://docs.mailtrap.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mailtrap.io/developers/inbound/threads/list-threads.md).

# List threads

Returns the inbox's conversation threads, ordered by most recent activity first.

Only threads and messages within your plan's retention window are included; the per-thread aggregates (message count, size, senders, recipients, attachments) are computed over those accessible messages.

Use `search` to narrow the list to threads whose subject, or any message's `from`, `to`, `cc`, or `bcc` address, contains the given text.

Results use cursor pagination, up to 100 threads per page. When more results are available the response includes a `last_id`; pass it back as the `last_id` query parameter (together with the same `search`, if any) to get the next page. When `last_id` is `null` you have reached the end.

```json
{"openapi":"3.1.0","info":{"title":"Inbound","version":"2.0.0"},"tags":[{"name":"threads","description":"A thread groups the inbound and sent messages that belong to the\nsame conversation. Use these endpoints to page through an inbox's\nthreads, fetch a single thread with its messages embedded, or delete a\nthread.\n"}],"servers":[{"description":"Mailtrap API","url":"https://mailtrap.io"}],"security":[{"HeaderAuth":[]},{"BearerAuth":[]}],"components":{"securitySchemes":{"HeaderAuth":{"type":"apiKey","description":"API token in Api-Token header","in":"header","name":"Api-Token"},"BearerAuth":{"type":"http","scheme":"bearer","bearerFormat":"JWT","description":"Bearer token authentication"}},"parameters":{"inbox_id":{"name":"inbox_id","in":"path","required":true,"description":"Inbound inbox ID","schema":{"type":"integer"}}},"schemas":{"ThreadsListResponse":{"type":"object","required":["data","total_count","last_id"],"properties":{"data":{"type":"array","items":{"$ref":"#/components/schemas/ThreadSummary"}},"total_count":{"type":"integer","description":"Total number of threads matching the query."},"last_id":{"type":["string","null"],"description":"Cursor for the next page. `null` when there are no more results.\n"}}},"ThreadSummary":{"type":"object","description":"Summary of a thread. All aggregates are computed over the messages you\ncan still access (those within the plan's retention window). The\n`subject` and the `*_at` timestamps describe the whole thread,\nincluding messages outside the retention window.\n","required":["id","subject","message_count","size","first_message_at","last_received_at","last_sent_at","last_activity_at","last_message_id","senders","recipients","attachments"],"properties":{"id":{"type":"string"},"subject":{"type":["string","null"],"description":"Subject of the thread's root message."},"message_count":{"type":"integer","description":"Number of accessible messages in the thread. Messages sent together\n(reply-all fan-out) count once.\n"},"size":{"type":"integer","description":"Combined size of the accessible messages, in bytes."},"first_message_at":{"type":"string","format":"date-time"},"last_received_at":{"type":["string","null"],"format":"date-time","description":"When the most recent inbound message arrived, if any."},"last_sent_at":{"type":["string","null"],"format":"date-time","description":"When the most recent message was sent, if any."},"last_activity_at":{"type":"string","format":"date-time","description":"Timestamp of the most recent message in either direction."},"last_message_id":{"type":["string","null"],"description":"ID of the most recent accessible message in the thread."},"senders":{"type":"array","description":"Distinct `from` addresses across the accessible messages.","items":{"type":"string"}},"recipients":{"type":"array","description":"Distinct `to`/`cc`/`bcc` addresses across the accessible messages.","items":{"type":"string"}},"attachments":{"type":"array","description":"Attachments across the accessible messages, with download URLs.","items":{"$ref":"#/components/schemas/AttachmentWithDownloadUrl"}}}},"AttachmentWithDownloadUrl":{"allOf":[{"$ref":"#/components/schemas/Attachment"},{"type":"object","properties":{"download_url":{"type":["string","null"],"format":"uri","description":"URL to download the attachment. Expires after one hour."},"download_url_expires_at":{"type":["string","null"],"format":"date-time"}}}]},"Attachment":{"type":"object","properties":{"attachment_id":{"type":"string"},"size":{"type":["integer","null"]},"filename":{"type":["string","null"]},"content_type":{"type":["string","null"]},"content_disposition":{"type":["string","null"],"enum":["attachment","inline",null]},"content_id":{"type":["string","null"],"description":"`Content-ID` header value, used to reference inline attachments\nfrom the HTML body.\n"}}},"UnprocessableEntity":{"type":"object","properties":{"errors":{"type":"object","additionalProperties":{"type":"array","items":{"type":"string"}}}}},"ErrorResponse":{"type":"object","properties":{"error":{"type":"string"}}},"ForbiddenError":{"type":"object","properties":{"errors":{"type":"string"}}}},"responses":{"Unauthorized":{"description":"Unauthorized","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}},"Forbidden":{"description":"Forbidden. The token lacks the permission required for this operation\n(`Access forbidden`), has no access to the account\n(`Account access forbidden`), or Email API/SMTP is not enabled for the\norganization (empty response body).\n","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ForbiddenError"}}}},"NotFound":{"description":"Not found","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}}}},"paths":{"/api/inbound/inboxes/{inbox_id}/threads":{"get":{"operationId":"listInboundThreads","summary":"List threads","description":"Returns the inbox's conversation threads, ordered by most recent\nactivity first.\n\nOnly threads and messages within your plan's retention window are\nincluded; the per-thread aggregates (message count, size, senders,\nrecipients, attachments) are computed over those accessible messages.\n\nUse `search` to narrow the list to threads whose subject, or any\nmessage's `from`, `to`, `cc`, or `bcc` address, contains the given\ntext.\n\nResults use cursor pagination, up to 100 threads per page. When more\nresults are available the response includes a `last_id`; pass it\nback as the `last_id` query parameter (together with the same\n`search`, if any) to get the next page. When `last_id` is `null` you\nhave reached the end.\n","tags":["threads"],"parameters":[{"$ref":"#/components/parameters/inbox_id"},{"name":"last_id","in":"query","required":false,"description":"Opaque cursor from the previous response's `last_id`. Omit on the\nfirst request. A malformed cursor returns `400`.\n","schema":{"type":"string"}},{"name":"search","in":"query","required":false,"description":"Case-insensitive substring match against the thread subject and\nthe `from`, `to`, `cc`, and `bcc` addresses of its messages.\nWildcard characters (`*`, `?`) are matched literally. Leading and\ntrailing whitespace is ignored; a blank value returns the\nunfiltered list. `total_count` reflects the filtered result.\n","schema":{"type":"string","maxLength":256}}],"responses":{"200":{"description":"List of threads","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ThreadsListResponse"}}}},"400":{"description":"Invalid `last_id` cursor or `search` value","content":{"application/json":{"schema":{"$ref":"#/components/schemas/UnprocessableEntity"}}}},"401":{"$ref":"#/components/responses/Unauthorized"},"403":{"$ref":"#/components/responses/Forbidden"},"404":{"$ref":"#/components/responses/NotFound"}}}}}}
```


---

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