Delete a message

Permanently deletes a single message from the specified inbox by its message ID.

Path parameters:

• :inbox — URL-encoded inbox address (e.g., test%40domain.com)
• :id — Message ID returned by GET /v1/inboxes/:inbox/messages

Behaviour:

• Returns 204 No Content on success — no response body.
• Returns 404 if the message or inbox does not exist.
• Deletion is immediate and irreversible.

Plan: All plans (Free and above).