What is port 3 used for?

From: Ajmo (alanjohnmoore@yahoo.com)
Date: 03/22/02 

From: Ajmo <alanjohnmoore@yahoo.com>
Date: Fri, 22 Mar 2002 23:28:13 +0100

I've got ipchains set to block all unecessary ports, but I'm seeing some
connections attempts on port#3 and they appear to be coming from email
servers. What is port #3 used for? (all I could find was a reference to
"source ports") Should I open it up? and if so to who?

TIA

Alan 

-- 
Alan Moore
Email:ajmo at infomediador dot com

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