[newbie] Ports

[Vic]

Hi everybody, I'm trying out gfcc the port configging app,
so far I'm learning how to use it, I want to block all
the ports except of course the ones I'm using on my server.

I wish to leave open 21 for ftp, 80 for www, and 25 for mail,
by the way, is the e mail server port just one for smtp and pop
or does pop have one of its own? I am taking my mail directly
off of my mail server with pine so maybe pop does not apply here??