Send a new message through a specified inbox. Supports text, HTML, and attachments.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
ID of the thread this message belongs to
ID of the inbox to send the message through
List of message recipients
1Message content blocks (text, HTML, attachments)
1Optional ID of the parent message (for replies)
Email subject line
998Additional custom metadata for the message
Message sent successfully
MESSAGE_DIRECTION_UNSPECIFIED, MESSAGE_DIRECTION_INBOUND, MESSAGE_DIRECTION_OUTBOUND MESSAGE_STATUS_UNSPECIFIED, MESSAGE_STATUS_SENT, MESSAGE_STATUS_FAILED, MESSAGE_STATUS_QUEUED 998