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U don't have to configure anything, just need to start the POP3 service.1. Type "setup" in ur console.2. Goto "system services"3. Check the pop3 services needed if u r using pop3. I think u r using POP3 to receive mail right?
Then, i think u better consult ricky on how to enable squid to open the port for POP3 mail retrieval. He's the Squid guru here.