Monitor a mail server

[Xi0N]

Maybe this is a dumb question but... how can i monitor from nagios that a remote postfix mail server is running?

Thanks!

[luca]

check_smtp cehcks if port 25 answers.
use check_by_ssh or whatever other system to run check_procs on the remote server...
these two should cover quite a lot.

[Xi0N]

Thanks!!!!