[Gllug] slightly ot: confused network

[Minty]

me=confused, looking for ideas....

wireless access point log is showing:

TCP connection rejected from 192.168.12.4:54832 to 192.168.5.2:113 (eth1)

192.168.5.2 is the wireless access point, which is nat'ing all the
clients connected to it (so all wireless clients appear on the network
to be the AP).

192.168.12.4 is my mailserver, debian, exim, courier (imap).  

I appear to get one log entry each time I try and send an email
(thunderbird, sending mail via exim on 192.168.12.4)

I can't find anything unhappy in the logs of the mailserver, and I can
send and recieve email no probs.

So it's not a huge problem, but I am curious.  Why is the mailserver
trying to ident the client?  Do I have some half arse authentication
I've messed up?
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