>I'm trying to set up my mail server; however I want to >make sure that I have the correct port(s) open. I >already have TCP port 25 open; however do I also have >to have UDP port 25 open as well? Any help would be >appreciated. > Extract from /etc/services: SMTP: smtp 25/tcp mail smtp 25/udp mail smtps 465/tcp # SMTP over SSL (TLS) POP: pop2 109/tcp pop-2 postoffice # POP version 2 pop2 109/udp pop-2 pop3 110/tcp pop-3 # POP version 3 pop3 110/udp pop-3 pop3s 995/tcp # POP-3 over SSL pop3s 995/udp # POP-3 over SSL IMAP: imap 143/tcp imap2 # Interim Mail Access Proto v2 imap 143/udp imap2 imap3 220/tcp # Interactive Mail Access imap3 220/udp # Protocol v3 imaps 993/tcp # IMAP over SSL imaps 993/udp # IMAP over SSL Now, make you picking, standard answer is: 25 for SMTP 110 for POP3 143 for IMAP /Kim
