[expert] Question about Nmap scan results

[Wayne Stout]

Greetings everyone!

Last night I decided to run nmap on my system and got the following
results. I understand everything except for the submission service on
port 587. Anyone know what this is? Also, I'm not quite sure what port
1025 is, either.

One final question. Do I need to have sendmail installed to use
logcheck? 

Thanks in advance,

Wayne

Port       State       Service
25/tcp     open        smtp                    
587/tcp    open        submission              
631/tcp    open        unknown                 
1025/tcp   open        listen                  
6000/tcp   open        X11