Question : qmail or postfix absolute path/cpanel

how can I tell if my server has postfix or qmail?
what would be the most common absolute path to either?

I have a dedicated server but I'm very new to the dedicated server world.

Answer : qmail or postfix absolute path/cpanel

It could just as easily have exim or sendmail. Furthermore, more than one MTA could be installed on the system with only one being used. So checking for the binary may not be conclusive. I'd suggest executing (on the server) 'telnet localhost 25'. That should return the MTA's welcome banner and thus its ID, e.g.:

wilowisp> telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 wilowisp.entrophy-free.net ESMTP Sendmail 8.12.10/8.12.10; Thu, 22 Jan 2004 09:09:28 -0600
quit
221 2.0.0 wilowisp.entrophy-free.net closing connection