Good day!  I've noticed an interesting interface issue with outbound mail
traffic.  Although the inbound SMTP-based communication works on the intended
interface, on one of my dual interface systems, the outbound mail transmits on
the primary and not the secondary interface.  In my case, with SPF/DMARC based
message validation, the outbound was not the correct public interface and would
throw an error with SPF invalidating DMARC as the correct outbound is the same
as my inbound interface.

Think of it this way.

eth0 - 10.0.0.1 - management
eth1 - 10.0.0.2 - synchronet / smtp / sendmail / etc.

Message traffic comes in on eth1 as does everything else.  When an outbound
internet message is sent, it egresses on eth0.

Anyone else see this?

The ../ctrl/sbbs.ini [Mail] section does have an Interface option, and if
filled with the correct interface becomes the interface the mail service
listens on.  There is, though, no outbound interface configurable.

Thoughts?

        Dream Master

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