[Mailman-Users] speed up mailman

[Stephen J. Turnbull]

Mark Sapiro writes:

 > Even with full VERP, Mailman should be able to deliver tens of messages
 > per second to Postfix. If it is slower than that, there is a n issue
 > with delivery. Once we have more info on whether the queue is backlogged
 > and what the delivery rate is, we can say more.
 > You might find some of the hits from the google search
 > 
 > site:mail.python.org inurl:mailman backlogged out queue
 > 
 > of interest.

If that doesn't make it obvious what you need to do, you might want to
tell us something about your configuration and use case.  What version
of Mailman?  Did you install as a package from a distribution or from
source?  If from a distribution, which one?

How big are the lists (number of subscribed addresses, maximum size if
there are several, and sizes can be order-of-magnitude like tens,
thousands, hundred million)?  How many such lists?  (As Mark says, you
still should be able to move up to 100,000 messages/hour with modest
hardware under normal conditions.)

Are your lists configured for personalization (eg, per-user
information such as subscription management URL in the footer)?

If Mailman >= 2.1.16, are your lists configured to deal with DMARC
issues (bounces of posts from AOL and Yahoo! addresses)?  Do you get a
lot of posts from those addresses?  (This can matter because DNS
transactions for DMARC can take a long time if for some reason your
path to those nameservers is slow.)