[Mailman-Users] mm-handler same as postfix-to-mailman.py

Dimitri Maziuk dmaziuk at bmrb.wisc.edu
Mon Jan 7 15:32:47 EST 2019

On 1/7/19 2:13 PM, Grant Taylor via Mailman-Users wrote:

> I think Sendmail (and other MTAs that I've tested) default to
> user at host.domain too.  But that's just a default that's easy to change.

LOL. Not on IRIX it wasn't.

> Or are you saying that you used
> MX records to route email to a different machine, possibly a mail hub?

That. If you want a single MX accepting mail for the Internet, you have
to have virtual domains on it for your every host, and make sure SMTP
and/or DNS reliable routes addres at host.domain to address at domain. Which
may be easier than I think, I never tried...

Granted we're talking "just one" @list.domain here. Well, maybe also
@list.domain... and then by strong mathematical induction we arrive at
the above.

> B) I would hope that other things like SPF / DKIM / DMARC would help
> reduce this considerably.  But I'm not going to hope enough to hold my
> breath.

But then you wouldn't need it in mailman: if it's spoofed as per dmarc,
you just reject it regardless ot its destination.

> C) ¯\_(ツ)_/¯  I suspect it's highly mailing list dependent.  -  I
> personally like to do as much as possible during the SMTP transaction.
> So if there is a reasonable way to apply some Mailman filtering logic to
> applicable messages, why not do it?

Like I said, it's probably whooping 10 extra lines of python -- as long
as you use postfix. The question is how much work it is to support other

Dimitri Maziuk
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu

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