> OK, so we sent out a mailing today at 11:30, and as of 11:58, there are
> still over 3100 .mail files in the folder.  Here's the current log.
> It's pretty long, due to begin in verbose mode, I suppose.

Your SMTP server is taking forever to queue those messages.  For example,
even before your mailing at 11:30, it's taking a full three seconds to
queue a message:

> 11 Feb 2013 07:21:36 <354 Start mail input; end with <CRLF>.<CRLF>
> 11 Feb 2013 07:21:39 <250 2.6.0 <[log in to unmask]> [InternalId=6285930] Queued mail for delivery

It looks like that gets even worse once things get busy:

> 11 Feb 2013 11:32:11 <354 Start mail input; end with <CRLF>.<CRLF>
> 11 Feb 2013 11:32:23 <250 2.6.0 <[log in to unmask]> [InternalId=6287430] Queued mail for delivery

Twelve seconds to queue that one.  If you look through the logs, you'll
see lots of similar queuing times.  If you can only get one message out
every 5-10 seconds, you can do the math as to how long it's going to take
your LISTSERV queue to empty.

As to why your SMTP server is taking so long, you'll need to run it down
from that end.  Some of the usual causes are things like inefficient
anti-virus and/or spam scanning of every message (my first guess), a disk
I/O bottleneck on the mail spool disk, inbound mail throttling, or
inefficient directory lookups for addresses to route locally.  Whatever
the case may be, you aren't going to be able to figure it out by looking
only at LISTSERV's end of things.  You need to go to the mail server.

--
Liam Kelly
Senior Consulting Analyst
L-Soft international
[log in to unmask]

L-Soft wishes you a Happy 2013
http://www.lsoft.com/happy2013.html

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