Received
# grep 'amavis' mail.log | grep Passed | wc -l
1411 (1189 if only counting CLEAN, post amavisd)
#grep 'amavis' mail.log | grep Passed | grep IPv6 | grep -v '::1' | wc -l
255 (253 if only counting CLEAN - so less spam in IPv6 :)
Sent
# grep 'postfix/smtp' mail.log | grep 'status=sent' | grep -v '127.0.0.1' | wc
-l
1422
# grep 'postfix/smtp' mail.log | grep 'status=sent' | egrep
'\[([a-f0-9]{0,4}:)+[a-f0-9]{0,4}\]' | wc -l
13 (filtered out a v6 IP that gets a copy of every mail)
18% incoming, .9% outgoing...
