[CentOS] IMAP security

Fri Mar 28 09:23:30 UTC 2008
Anne Wilson <cannewilson at googlemail.com>

I have port 143 open so that I can get my mail when away from home.  
Occasionally, though, my router reports things like

Thu, 2008-03-27 02:00:11 - TCP Packet - Source:200.122.134.9,3821 
Destination:88.97.17.41,143 - [IMAP rule match]
Thu, 2008-03-27 05:39:49 - TCP Packet - Source:140.127.181.141,3461 
Destination:88.97.17.41,143 - [IMAP rule match]
Thu, 2008-03-27 16:10:03 - TCP Packet - Source:80.88.161.125,2352 
Destination:88.97.17.41,143 - [IMAP rule match]

Looking at those addresses in whois, I don't see any good reason for these, 
and I'm concerned in case they are relays.  Advice?

Anne
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