[Mailman-Users] Email response very slow using Mailman and sendmail

[Brad Knowles]

Patil, Manjiri S wrote:

> I do see that SENDAMAIL is trying to send messages only to bunch of
> people which varies from 10 to 50 at time. Also how do I tune up
> SENDMAIL with number of recipients to process at one time?

Ten to fifty users is actually quite a lot.  You're not likely to get too 
much more than this, because a lot of MTAs on the Internet are configured to 
refuse to accept messages from you if you've got too many recipients.  Some 
of these sites set the limit as low as ten users, some set it higher (like 
fifty or 100).

In your case, turning on personalization and VERP may actually help your 
message delivery because you won't be triggering such limitations, and you'd 
have a better idea of which recipients were causing problems for you.  Even 
though this would reduce the number of recipients per message, the end 
result may well be an improvement.

> ****Apr 17 09:30:30 smgpub sendmail[27208]: m3HD1x7v027207:
> to=<awolk at bu.edu>, delay=00:28:31, xdelay=00:28:31, mailer=esmtp 
> 9147447, relay=relay.bu.edu. [128.197.27.198], dsn=5.1.1, stat=User
> unknown

Thirty minute delay once sendmail got the message.  That's a sendmail issue, 
or an issue with the remote site.

> ****Apr 17 10:00:02 smgpub sendmail[27208]: m3HD1x7v027207:
> to=<... at bu.edu>,<.... at bu.edu>,<....da at bu.edu>,<.....@>
> ,<.... at bu.edu>,<.... at bu.edu [more], delay=00:58:03, xdelay=00:58:03,
> mailer=esmtp, pri=9147447, relay.bu.edu. [128.197.27.198], dsn=2.0.0,
> stat=Sent (m3HD1x78004079 Message accepted for delivery)

One hour delay, once sendmail got the message.  Again, that's a sendmail 
issue, or an issue with the remote site.

> ****Apr 17 10:00:02 smgpub sendmail[27208]: m3HD1x7v027207:
> to=<rkgupta at bu.edu [more], delay=00:58:03, xdelay=00:58:03,
> mailer=esmtp, pri=
> 7, relay=relay.bu.edu. [128.197.27.198], dsn=2.0.0, stat=Sent
> (m3HD1x78004079 Message accepted for delivery)

Ditto.

> ****Apr 17 10:00:02 smgpub sendmail[27208]: m3HD1x7v027207:
> to=<tbrennan at bu.edu>, delay=00:58:03, xdelay=00:00:00, mailer=es
> ri=9147447, relay=relay.bu.edu. [128.197.27.198], dsn=5.1.1, stat=User
> unknown

Ditto.

> ****Apr 17 11:01:03 smgpub sendmail[27208]: m3HD1x7v027207:
> to=<sgsegal at bu.edu>, [more], delay=01:59:04, xdelay=01:01:01,
> mailer=esmtp, pri=9147447, relay=relay.bu.edu. [128.197.27.198],
> dsn=2.0.0, stat=Sent (m3HD1x7A004079 Message accepted for delivery)

Two hour delay, once sendmail got the message.


None of these really have anything to do with Mailman.  You need to fix your 
sendmail configuration, or talk to the people at the remote sites and find 
out why they're causing such huge delays.  Get a copy of the book "Sendmail 
Performance Tuning" by Nick Christenson.

-- 
Brad Knowles <brad at shub-internet.org>
LinkedIn Profile: <http://tinyurl.com/y8kpxu>