Nerd sniped myself by trying to use PostfixAdmin from @mwl Run Your Own Mail Server, but the version in Ubuntu is from ages ago and the debian packaging mechanism seems to have been unmaintained for a number of years so I forked the upstream and hacked it to minimally work on my machine.
Also trying to simultaneously use Postfix in multi-instance mode, which is not covered in #RYOMS, but if something is worth doing it's worth overdoing, I guess.
Like I didn't have enough unshaved yaks already.
@daedalus gawd! I remember running postfix. I’m going to need some quiet time now. *shudder*
@bigjsl @daedalus “Sendmail”
@drscriptt @bigjsl sendmail.cf without m4 macros

@daedalus @bigjsl I was thinking that, but didn’t say it.

I cut my teeth on sendmail.cf with m4 macros.

So I didn’t want to mention something I’ve not administered.

@drscriptt It was a diabolical thing to have to do, really, all that line-noise-esque syntax. And yet it worked, more or less.

@daedalus

What are you doing that has you running multiple instances of Postfix?

I think I’ve only ever run multiple MTAs on one system once or twice in the last 25 years.

And that was to deal with some very special MSA to MTA situation.

Otherwise I’ve always been able to use a single MTA.

@drscriptt It'll help me to reason about the way mail flows through the border gateway, various spam filters and the mailhub system. I'm using a few all-in-one instances now (different network segments, different virtual orgs) and sometimes it's confusing how it all fits together.

@daedalus fair enough.

Using multiple simpler configurations verses one more complex configuration is something that I’ve done multiple times.

I currently have multiple routers with two interfaces; inside and outside vs three or more interfaces; out0, out1, lan0, lan1, lan2, for the very reason you’re talking about multiple MTAs.

Have you considered multiple systems, each with one MTA? Taking the reason you’re describing to the next logical level.

I’m just talking hypothetical and trying to learn from your efforts.

Thank you for explaining. 🙂

@drscriptt yeah, I currently have multiple systems, each with an MTA. Trying to consolidate a couple of them.
@daedalus @mwl I remember running postfix at a small biz with greylisting and I thought it was the best anti spam ever. Long lost to the ubiquity of office 365 though. Sad that nobody even maintains the packages
@mosen Postfix is maintained fine. PostfixAdmin is a PHP webapp to make multi-domain virtual hosting easier to maintain. It's maintained, just not the packaging for debians.
@daedalus @mwl You could always use #FreeBSD and then you get that sweet #ZFS sauce that is a first class citizen on the operating system. Plus porters keep software up to date, not some snapshot of old code when the distro was released.