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Another possibility: tarpitting or throttling on the SMTP host. Be sure your LISTSERV's IP has been exempted from anti-spam measures like that on your SMTP host.
On Feb 11, 2013, at 3:37 PM, Valdis Kletnieks <[log in to unmask]> wrote:
> 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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