RFC 822

This transmits the raw email data with the message/rfc822 content type.

You will need to configure your webhook server endpoint to accept this content type.

You will need to handle all parsing yourself.

This is useful if you want to store the raw email for archiving or other purposes.

Mailcast can make multiple webhook calls for every incoming email so you can use this method to send the raw email and JSON to process the parsed information.