Ajay Kajla wrote:

I have been using mailman+sendmail on a CentOS Linux VPS box, with 2 x Intel(R) Xeon(TM) MP CPU 3.66GHz CPUs, and 2 GB RAM. The list is of around 65000 users.

Form the past few weeks server seems to be very slow in delivering mails. I have been receiving mailer approximately with 2 hours delay.

*******Mailman is taking 30979.910 seconds for 65660 users******* Oct 31 10:02:28 2010 (7270) <201010310625.o9V6PY9t028494@xyz.com> smtp to xyz for 65660 recips, completed in 30979.910 seconds

And presumably the "last" users have been seeing over 8 hours delay.

Also, possibly Mailman's out/ queue is backlogged.

*******Whereas another server with came Specs and configuration is just taking 12517.834 for larger (79579) number of users.*******

Oct 31 19:10:25 2010 (12027) <201010311653.o9VGrCqX024525@abc.com> smtp to abc for 79579 recips, completed in 12517.834 seconds

That's still too long to be viable.

Can you please suggest me how to improvise the performance of mailman

Go to the FAQ at <http://wiki.list.org/x/AgA3> and search for "performance".

or how about if I want to migrate the mailman from Sendmail to Exim ?

See <http://www.exim.org/howto/mailman21.html> for information on integrating Exim and Mailman

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