Andy wrote:

There is a problem with extremely slow e-mails distribution over discussion lists. Mails are delayed from about 12 to 24 hours (no matter what activity on the lists, even when list is almost not active at all the delay is still that big). The problem with slow mails distribution concerns not only mails distributed to subscribers, but also administrative mails send by mailman (for example as reply to commands sent to request-listname@domain.name). However, e-mails appear quickly (virtually no delay) in the archive, but I repeat that their distribution to list members is delayed by many hours, and some e-mails even go astray.

From your description, I am guessing that you are doing some time consuming validation on SMTP transactions in your outgoing MTA and OutgoingRunner is hopelessly backlogged. If this is the case, it should be obvious from a detailed look at Mailman's 'smtp' log. If you're seeing SMTP for hundreds of recipients taking more than a few seconds and the difference between the timestamps of adjacent entries equal to the duration of the first entry, this is your problem.

For starters, don't do DNS validation of RCPT commands in the MTA. Then look at the tuning tips for your MTA in section 6 of the FAQ <http://www.python.org/cgi-bin/faqw-mm.py>.

-- Mark Sapiro <msapiro@value.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan