E-mail passwords sniffing - HELP!!

I've been notified by the administrator of a server that someone, after hacking his server, has installed SniffIt and pointed it to one of mine servers, and he sniffed a lot of email usernames and passwords.E-mail passwords sniffing - HELP!!
Telnet access is disabled and email users cannot login with ssh, can someone tell me if I have to worry? There's a way to prevent sniffing on port 110 (POP3)?
Thanks!
Ricky

 

 

 

 

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