High CPU Usage by Qmail (Plesk 9.x)

Qmail (Default Mail Server for Plesk) on Plesk 9.0 sometime start consuming high CPU and overloading server. This sometime happens due to lot of failed message to ‘postmaster’ which overload Qmail. Following is the header of the failed message: From: MAILER-DAEMON@server.mail.com To: postmaster@server.mail.com Subject: failure notice Date: 10 Apr 2010 02:49:00 +0100 Size: 17540794 bytes […]