If you want to test the responsiveness of the LISTSERV application itself,
port 2306 is a good bet:

+> telnet localhost 2306
Trying 127.0.0.1...
Connected to localhost.
Escape character is 'Ø]'.
thanks
You're welcome!
quit
Connection closed by foreign host.

So port 25 to test mail connectivity, port 2306 to test application
responsiveness, and port 80 to test the web interface.  That will cover
most types of failures, except those where you have something like a huge
mail queue backlog or a mail routing configuration issue.  Checking for
PID files and process names can be helpful, but it doesn't always tell you
if the process is actually doing anything useful or if the PID file is
stale and didn't get cleaned up after a crash.

--
Liam Kelly
Senior Consulting Analyst
L-Soft international
[log in to unmask]

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