[CentOS] IMAP rule problem

I have a problem with local mail on this netbook. I'm sure it's something obvious, but I could use another brain's input.

Fri, 2008-11-28 13:15:27 - TCP Packet - Source:192.168.0.7,58711 Destination:88.97.17.41,143 - [IMAP rule match] Fri, 2008-11-28 13:15:27 - TCP Packet - Source:192.168.0.7,58711 Destination:192.168.0.40,143 - [IMAP rule not match]

The first one delivers mail through my Roaming profile, using googlemail's smtp. The second one sends to my own smtp server for local delivery, something that's happening all the time from other boxes.

Since my brain is reluctant to get in gear over this, where should I be looking for the problem?

Anne