> The point I was making about the postfix configuration is that it works
> when the SPF/TXT record for the domain only includes the IP of the domain
> on the virtual interface without having to include the default eth0 IP as
> well. This is the "magic" I was hoping courier could also emulate. Ie;...
> 126.96.36.199- unix - n n - - smtp
> -o smtp_bind_address=188.8.131.52
> So is the bottom line there is no way for courier to provide a binding to
> the virtual interface so that it would pass SPF checks without having to
> add the default eth0 IP of 184.108.40.206 to the SPF record for eth-os.org?
If you're looking to have /all/ outgoing mail sent from a socket that's
bound to that IP address, this would be the SOURCE_ADDRESS (or
SOURCE_ADDRESS_IPV6) setting in the courierd configuration file.
I'm not familiar with Postfix config setting, but I didn't see anything
there that's domain specific, so I'm assuming that all it does is set the IP
address for outgoing sockets, for all mail. That's the SOURCE_ADDRESS