[Mailman-Users] Performance issues with 12K subscribers and 14K subscribers and personalized footers.

[Stephen J. Turnbull]

Bryan Wright writes:

 > Now I just need to fine-tune sendmail so it speeds up as well, but
 > that's a question for elsewhere.

Just a guess, but it may not be sendmail per se.  If there are issues
with the DNS, that could result in multiple long delays, giving the
half-hour time you're seeing for not all that many messages.  Of
course sendmail may be throttled for some reason, or an upstream
gateway is throttling your host, or something.