I'm working on setting up a Sophos XG and would LOVE to use the Sophos XG's mail systems to be the 'exfil' mail server with a specific HELO name and a specific IP address on the system.
The system has multiple WAN IPs and because not all of them are properly set up with rDNS for mail to work properly, I need to make sure the XG doesn't try and send as the WAN interface IP but as one of its aliases.
Is there a mechanism to set this in the Sophos XG's email (relay/MTA) system for how it exfils to the Internet?
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