import { createClient } from "@mailsai/sdk";

const client = createClient(); // reads MAILS_API_KEY

const result = await client.threads.remove(
  "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E",
);
console.log(result);

from mailsai import create_client

client = create_client()  # reads MAILS_API_KEY

result = client.delete_thread(
    "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E",
)
print(result)

curl -X DELETE 'https://api.mails.ai/v1/threads/thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E' \
  -H "Authorization: Bearer $MAILS_API_KEY"

mails threads delete thrd_01JABC
mails threads delete thrd_01JABC --permanent --yes

{
  "name": "mails_threads_delete",
  "arguments": {
    "thread_id": "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E"
  }
}

{
  "id": "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "agent_id": "agt_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "subject": "<subject>",
  "root_message_id": "msg_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "last_message_id": "msg_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "last_message_at": "2026-10-04T12:00:00.000Z",
  "message_count": 0,
  "participants": ["jordan@example.com"],
  "labels": ["<labels>"],
  "label_ids": ["lbl_01JZX8K3M9Q4P7VN2YB6RTDC0E"],
  "status": "open",
  "read": false,
  "folder": "inbox",
  "trashed_at": "2026-10-04T12:00:00.000Z",
  "test_mode": false,
  "created_at": "2026-10-04T12:00:00.000Z",
  "updated_at": "2026-10-04T12:00:00.000Z",
  "deleted": false
}

200  The trashed thread, or the id of the thread deleted
     for good.
400  Invalid request — malformed JSON or a field failed
     validation. Also feature_not_enabled when this
     server has a feature switched off (custom domains
     before they are available).
401  Missing or invalid API key.
403  The API key lacks the required scope
     (insufficient_scope), or the token belongs to an
     app connected by sign-in and this operation is
     closed to connected apps
     (connected_app_not_allowed).
404  Resource not found in this workspace, or the agent
     a send names is archived (agent_archived).
409  Conflict — duplicate resource, an in-progress
     idempotent request, a draft or scheduled message
     that started sending while it was being changed, or
     a thread deleted for good while one of its messages
     is being sent (duplicate_resource); or an agent
     name more than one agent has (agent_name_conflict:
     use the agent's id); or a status change on an
     archived agent, since archiving cannot be undone
     (agent_archived).
500  Internal server error.

Trash or delete a thread

Moves the thread to trash (deleted: false, the thread returned).

DELETE/v1/threads/{id}scope · manage

import { createClient } from "@mailsai/sdk";

const client = createClient(); // reads MAILS_API_KEY

const result = await client.threads.remove(
  "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E",
);
console.log(result);

from mailsai import create_client

client = create_client()  # reads MAILS_API_KEY

result = client.delete_thread(
    "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E",
)
print(result)

curl -X DELETE 'https://api.mails.ai/v1/threads/thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E' \
  -H "Authorization: Bearer $MAILS_API_KEY"

mails threads delete thrd_01JABC
mails threads delete thrd_01JABC --permanent --yes

{
  "name": "mails_threads_delete",
  "arguments": {
    "thread_id": "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E"
  }
}

{
  "id": "thrd_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "agent_id": "agt_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "subject": "<subject>",
  "root_message_id": "msg_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "last_message_id": "msg_01JZX8K3M9Q4P7VN2YB6RTDC0E",
  "last_message_at": "2026-10-04T12:00:00.000Z",
  "message_count": 0,
  "participants": ["jordan@example.com"],
  "labels": ["<labels>"],
  "label_ids": ["lbl_01JZX8K3M9Q4P7VN2YB6RTDC0E"],
  "status": "open",
  "read": false,
  "folder": "inbox",
  "trashed_at": "2026-10-04T12:00:00.000Z",
  "test_mode": false,
  "created_at": "2026-10-04T12:00:00.000Z",
  "updated_at": "2026-10-04T12:00:00.000Z",
  "deleted": false
}

200  The trashed thread, or the id of the thread deleted
     for good.
400  Invalid request — malformed JSON or a field failed
     validation. Also feature_not_enabled when this
     server has a feature switched off (custom domains
     before they are available).
401  Missing or invalid API key.
403  The API key lacks the required scope
     (insufficient_scope), or the token belongs to an
     app connected by sign-in and this operation is
     closed to connected apps
     (connected_app_not_allowed).
404  Resource not found in this workspace, or the agent
     a send names is archived (agent_archived).
409  Conflict — duplicate resource, an in-progress
     idempotent request, a draft or scheduled message
     that started sending while it was being changed, or
     a thread deleted for good while one of its messages
     is being sent (duplicate_resource); or an agent
     name more than one agent has (agent_name_conflict:
     use the agent's id); or a status change on an
     archived agent, since archiving cannot be undone
     (agent_archived).
500  Internal server error.

Path Parameters

idstringrequired

Thread id.

Query Parameters

permanentboolean

true deletes the thread for good instead of moving it to trash.

Sent again for a thread already in trash it changes nothing, so a retried request never destroys mail. With permanent=true it deletes the thread for good, from any folder: its messages' content, raw email and attachments are removed, and thread.deleted is emitted. Trash is also emptied automatically 30 days after a thread was moved there. A test key cannot trash or delete a thread holding live mail (403 live_mode_required). An app connected by sign-in may move a thread to trash but not delete it for good: with permanent=true it gets 403 connected_app_not_allowed.

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