TCP & UDP Port Question

I have a RedHat 8.0 box running Apache and Mailman. I am trying to make sure
it is locked down. When I run a port scan with nmap, I find the following
TCP ports open: 

25 -- Mail
80 -- WWW
111 -- SUN RPC 
443 -- SSL 
515 -- spooler 
6000 --  X Windows 
32768 -- Filenet

Now, I know I need 80 and 25 open, but can't I just close the rest? How do I
close a specific port within the RedHat OS? 

One last question, the port scan also returns 81 UDP ports as open or not
answering, should I close these as well?  

I would appreciate any info.....



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