On Tue, 27 Feb 2001 11:54:02 -0800 Neil Kandalgaonkar <neilk@ActiveState.com> wrote:

We're using Mailman to manage many lists. Our announcement list is very large, 50,000+ users.

Whenever we post a message to the very large list, posts stop flowing from the others.

This is a performance tuning problem. You need to do a flowpath analysis to see where your bottlenecks are and what is causing them. Probable causes:

-- Bad choice of MTA (eg Sendmail) -- Bad configuration of MTA (eg list posts are DNS verified upon receipt) -- Bad name resolution support (eg no system-local DBS cache) -- Bad RCPT TO size bundling (mailman config)

I've looked through the Mailman source to figure out why, and I'm stumped. It seems to me that nothing should be impeding the other lists from injecting their messages into the queue, interleaved with the mass mailout from the announcement list.

Without knowing the version of Mailman being used and a host of other system particulars, this is impossible to answer. My best guess however would be choice of MTA and bad MTA configuration as the likely causes.

-- J C Lawrence claw@kanga.nu ---------(*) http://www.kanga.nu/~claw/ --=| A man is as sane as he is dangerous to his environment |=--