Postfix logging
From thelinuxwiki
postfix and syslog-ng logging
added to /etc/syslog-ng/syslog-ng.conf
destination mail { file("/var/log/mail.log"); };
filter mail { facility(mail); };
filter notmail { not facility(mail); };
log { source(src); filter(mail); destination(mail); };
log { source(src); filter(notmail); destination(messages); };
