LINUX syslogd uses synchronous writes by default. Because
of this, syslogd can actually use more system resources than
Postfix. To avoid such badness, disable synchronous mail logfile
writes by editing /etc/syslog.conf and by prepending a - to the
logfile name:
/etc/syslog.conf:
mail.* -/var/log/mail.log
Send a "kill -HUP" to the syslogd to make the
change effective.
