On Mon, 11 Feb 2013 15:17:07 -0500, Liam Kelly said:

> 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.

Even today in 2013, an amazing percent of SMTP servers have broken DNS
setups that cause a lot of waits for DNS lookup timeouts.  Just a thought...

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