On 11/16/2011 7:56 PM, Alex wrote: > 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. http://www.postfix.org/documentation.html http://www.postfix.org/TUNING_README.html If zombie spambots are using up most of your available connections, postscreen will likely help. http://www.postfix.org/POSTSCREEN_README.html Other things to check for are your DNS speed and hard drive performance. At any rate, you need to examine your system to find the bottleneck. -- Noel Jones
