api_key: your server-side Production key.email_id: an email returned byPOST /v1/emails.message_id: a message returned by the list operation.attachment_id: an attachment listed on a message.
Resources
Postman collection
Import the maintained eight-operation v1 collection.
Download the maintained Postman collection, or import that URL directly into Postman. The relative download path continues to work if the documentation moves to a custom domain.
Set the collection variables:
Last modified on August 8, 2026