Doug,

Here are some common ports.


7 Echo
21 FTP
23 Telnet
25 SMTP
53 DNS
79 Finger
80 HTTP
110 POP3
119 NNTP
161 SNMP
162 SNMP Trap

The ports above do not include the ports used when ssh is involved.

I will be out of the office this afternoon. I'm not sure when I will get back. If your using RedHat Linux, visit their site and do a search for sendmail. They have a pretty good HOWTO on sendamil.

http://www.redhat.com/