10.8.2 Server: Ports not open

Hello

I try to configure a ML Server and want it to configured aas a mail server. So I configured DNS names, mail domains, Users and so on.

Now when I try to configure a mail client to receive mails via IMAP the server won't respond. So I tested all open ports on/to the server. Now I noticed that port 110 and 143 is not open. So any 1 knows how to open these ports in ML?

OS X 10.8.2 (Build 12C54) and Server 2.1.1 (Build 12S365)

Many thanks for any informations.

Dominique