[Mailman-Users] Upgrading and converting mailman to postfix

What does Red Hat tell you about migrating from sendmail to postfix with RHEL3 -> RHEL6? In my experience, postfix goes pretty far out of its way to be as much of a drop-in replacement for sendmail as can reasonably be done.

But that's in a more typical Unix type of environment where you're building tools from source, or using a BSD-style "ports" system. I can't speak for how that would work in a more regimented binary-only RPM package environment.
My experience has been that postfix is the most natural MTA to pair with Mailman, and I've been involved in the postfix community since the very earliest days back when Wietse was still calling it VMailer. We've been using postfix with Mailman on python.org at least as long as I've been involved in the Mailman project -- and we're talking multiple years in both cases.

By default, postfix includes some standard tools for taking the same sorts of source files and turning them into a postfix-native binary format (by replacing the "newaliases" command, among other things).

However, I don't know how Red Hat chooses to modify that situation when they build a postfix package for their platform. You'd have to ask them where their tools are and how those tools change from one version of RHEL to another.

This is a RedHat packaging question. See the FAQ at
<http://wiki.list.org/x/KYCB>. If your RedHat package is 2.1.5-21 or
later, it should be no problem. If it is 2.1.5-20 or earlier, many files
and directories move as discussed in the FAQ, but the FAQ also tells you
where to find a migration script and RedHat's documentation.


No conversion is required. Postfix can use the same Mailman aliases as
Sendmail in /etc/aliases except that the path to the wrapper may change
from /var/mailman/mail/mailman to /usr/lib/mailman/mail/mailman because
of the file changes above.

On the other hand, the new package may make various changes in both
postfix and Mailman to enable Mailman/Postfix integration, in which case
all you'd need to do after migration is to remove Mailman's aliases from
/etc/aliases and run Mailman's bin/genaliases to generate the new aliases.