I'm trying to use telnet (debian lenny 5.0.2) to check behavior of a postfix installation, but I can't telnet to smtp.
telnet localhost smtp telnet: Unable to connect to remote host: Connection refused
telnetting to port 25 doesn't work either. I can telnet to port 110 and pop3.
How should I go about debugging this?
UPDATE: The command ps aux|grep 'postfix' revealed that postfix wasn't running. Inspection of /var/log/mail.err and /etc/postfix/main.cf uncovered a typo in main.cf. After correcting that, postfix ran fine.
Note that 'postfix start' returned a message reporting that postfix was starting. When postfix wasn't starting, no error message or warning was returned.