LINUX syslogd uses synchronous writes by default, which is very expensive. For services such as mail it is recommended that you disable synchronous logfile writes by editing /etc/syslog.conf and by prepending a ”-” to the logfile name.
mail.* -/var/log/mail.log
Restart your syslod to make the changes effective
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source:http://linuxpoison.blogspot.com/2008/04/13578175805977.html