Well, I had a very bad time with mailman and sendmail today. I was assuming the problem was with sendmail. After screwing around with it all day, I'm not so sure the problem is sendmail. I found the following items: 1) A LOT of people on the list have very slow mailservers. This is bad in conjuction with the way mailman queues messages. 2) All the junk email coming into the list gets a "your post awaits moderator approval" return email, and most of those domains don't exist, or have servers that are extremely bogged down, also causing a problem with the way mailman queues messages. 3) Mailman queues messages in very large groups. A single post to the list generates 4 emails, each one with around 150 recipients. When sendmail processes one of these single messages, as it sends to one of the recipients and encounters a VERY slow mail server, everyone else on the recipient list just sits and waits. The delays are... to me... well... horrid. 4) When I set mailman to send one email per recipient, sendmail still only had one runner processing the queue. Of course, the same problem exists them as #3. Everything I tried seemed to make it the same or worse. I tried starting a separate localhost only daemon of sendmail which doesn't do DNS lookups, setting the outbound sendmail daemon for persistant queueing, put in a caching only nameserver on the mailserver, set mailman to send one recipient per message, etc. before running out of time to work on this. I suspect that this all started with the upgraded mailman, this version apparently has it's own message queueing and is very different from previous versions. I've kinda hit the point of not being able to see the forest for the trees, so if someone is up on mailman and sendmail I'd appreciate some insight. If you have some thoughts (besides "dude, switch to using XXXXX for your MTA"), please email me directly so I get the email quickly. In response to the people who have suggested replacing sendmail... I would like to call attention to what the website for mailman says. Bear in mind, the mailman camp is somewhat anti-sendmail, instead favoring qmail, exim, and postfix. However, note what THEY say about sendmail... "Moreover, with appropriate work, sendmail can be configured to be the fastest and highest-volume general-purpose MTA on the planet." This is in the section where they compare sendmail to exim, qmail, and postfix. So I'm not the only one who believes in sendmail. I put things back the way they originally were. I'll ponder it over the weekend. Regards, Jay West jwest(a)classiccmp.org --- [This E-mail scanned for viruses by Declude Virus]