Technical Tip: How to allow empty 'Envelope From' emails such as automatic reply/Out of office replies to be relay to external recipient

[pchee]

Description	This article describes how to allow empty 'Envelope From' emails such as automatic reply/Out of office replies to be relay to an external recipient
Scope	FortiMail.
Solution	Automatic reply/ Out of office email was not able to relay over FortiMail because the From column was empty. Mail server receive error '{LED=554 5.7.1 Relaying denied}][{LED=554 5.7.1 Relaying denied}'. Navigate under Policy -> Access Control -> Receiving. Select the 'New+' button and set the sender to wild card '*' and Recipient to 'External'. Specify the source to be a specific mail server IP to avoid open relay from FortiMail. Set the action to 'Safe & Relay'.