root@krogon:~# cat /var/log/mail.*
root@krogon:~# grep -nR mail /etc/rsyslog.d/50-default.conf
14:mail.*               -/var/log/mail.log
18:# Logging for the mail system.  Split it up so that
21:mail.info            -/var/log/mail.info
22:mail.warn            -/var/log/mail.warn
23:mail.err         /var/log/mail.err
37: news.none;mail.none -/var/log/debug
41: mail,news.none      -/var/log/messages
52:#daemon,mail.*;\
65:daemon.*;mail.*;\ `