sendmail option seemed to really help. I'm down to 4 to 10 minutes with most messages at 6.
It really helps when you move those slow MTA's to the end of the line, they don't block the messages getting out to the quicker ones.
That is another recommendation common to the papers by Kolstad, Chalup, Christensen, myself, etc....
Yes. Postfix. For you that would be a fairly easy change. RedHat 9 comes with an MTA changer that will move you over to Postfix automagically. I don't know the effect that will have on Mailman, but I've heard from third-hand sources that it works fine (which I find surprising).
Out-of-the-box, postfix tends to be well-designed for use with mailing lists. With work (and some money), you can configure sendmail to outperform even postfix on the same box, but this is not trivial.
BTW: I looked at the the other fellows recommend web-sites. This one seemed worth the trip, and a good recommendation for reading (though a bit dated). Most of it was general to any Mail server. http://www.jetcafe.org/npc/doc/performance_tuning.pdf
Nick's got a good paper, but when it comes to mailing lists, don't ignore the papers by Kolstad or Chalup.
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