Hi, >> I built a dual-Xeon quad-core box with 8GB using fedora15 and >> postfix-v2.8.5 and during various times during the day connections to >> port 25 timeout or are very slow. The majority of times this happens >> is under peak loads, but even times when it's not at capacity it may >> do this. > > Often slow smtpd connections are caused by not having enough smtpd > processes running. > > On your hardware, postfix will support thousands of smtpd processes. > Use netstat or lsof to see how many connections postfix is handling > when you experience slowdowns.
It's in the hundreds. There is also some amount of iowait, but I don't think that's the issue. When using amavisd-new, shouldn't the number of processes match the number of smtpd processes? I think what I'm concerned about is having postfix receive more messages than amavisd can process? > If zombie spambots are using up most of your available connections, > postscreen will likely help. > http://www.postfix.org/POSTSCREEN_README.html Yes, looks like this would be a good thing to do is a general idea. Thanks again, Alex
