Email and firewall ports

Stky10

I realise that this in partly a linux question and partly a security question, but anyway......

I've created an email server here that runs postfix, imapd and squirrel mail on Suse 9.0. Its behind a firewall, and I want the network administrator to open up the necessary ports. IMAP passwords are verified by SSL.

So my question is which ports to I need opened up?.

Postfix means port 25 for smtp, imapd would normally require 143 but since its verifing only using SSL, does this mean I only need 993 and not 143, or both?. Also, does would the web interface of squirrel mail require both ports 80 and 443 open?.

I realise that I could answer this by opening ports
one by one and seeing what was needed and what
wasnt, but I dont have too much access to the network admin and I dont want to be going backwards and forwards to him all day long.

DaemÈn

would running a port sniffer one your machine tell u what ports were open and what service was using them ?

Kali

993 is only for imap4 + ssl.

if its imap2 (port 143) and you intend to allow smtp then i'd assume that you would need the 3 ports (25,143,443)

osmethod

Check the /etc/services file and you'll see how the ports are assigned to the services/daemons you want.