>> I have an email server running Exim, Dovecot, Spamassassin, Clam, etc. > > Firstly, I'd drop dovecot completely, cyrus-imapd has, for me, been a lot > faster and better optimised for situations where you have more than a few > hand full of users. > > Secondly, exim configs out of the box on CentOS are *really* not optimized > for performance at all. If you handle more than a few thousand emails an > hour, I dont be surprised if exim is to blame for jamming your i/o pipe just > trying to work out which email to attempt delivery for next. This is a Directadmin type server. So I really have no options on changing services. I am running exim version 4.60 and I wander if updating to 4.69 may help out. Matt