Email server problems

Hi there, I've got a server running Fedora Core 1, cpanel, exim and cppop, the mail side of things (smtp, pop3) was working up until about an hour ago when I updated the server software through cpanel, ever since then though, I've been unable to get connected from remote machines (I can connect to the necessary ports locally no problem)

Anyone got any hints as to where I should be looking to fix this?

 

 

 

 

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