v52

OpenAPI 3.1.0raw.githubusercontent.com2026-07-311,1941,9384.1 MB
Email Inboxes

Reply to an inbox message

Sends from the inbox address through the standard email send pipeline. The recipient is the original Reply-To, falling back to From; original Cc recipients are not included. The subject is prefixed with Re: unless it already has that prefix.

Threading headers are derived from the original message: In-Reply-To is set to its RFC Message-ID, and References contains the original References values plus that Message-ID, de-duplicated and limited to the most recent 20 values.

post/email_inboxes/{inbox_id}/messages/{message_id}/actions/reply

Path parameters

inbox_idstring uuid required

Email inbox UUID.

message_idstring uuid required

Inbound email message UUID.

Request body

OR

Response

Reply accepted by the standard email send pipeline.

Example response

{
  "data": {
    "recipient_statuses": {
      "bounced": 2,
      "delivered": 998
    }
  }
}