Have a look at Postfix "transport maps" I think Weitse already suggested it and it's what I'm using.
It's just a one liner config file. This is mine: $ cat /etc/postfix/transport_maps # Mail to anyone at opendmz.com is sent via SMTP to haproxy opendmz.com smtp:haproxy:10025 The haproxy is an unnecessary layer of complication I added, but it could just as easily be your home IP. I'm using dynamic DNS in case my home IP changes, but it hasn't changed in over 3 years now! for example: opendmz.com smtp:my-home-ip.dyndns.org:25 On 10/06/2019 00:02, Ronald F. Guilmette wrote: > Yes, yes, and yes. This definitely sounds a lot like what I want to > do. I've just never set up Postfix as a relay before, so I haven't > even been thinking in those terms, because I don't even know how to do > this... yet. > > Thanks for the suggestion. I have a lot of reading to do.
