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ipf/ipmon & mail to hotmail?

My system is configured to reject any incoming connection unless
it's to port 25 or 53. ipmon is used to log all blocked connections.
Here's a logfile entry which made me curious:

@0:28 b,25 ->,1524 PR tcp len 20 52 -AF

This happens when I send e-mail to a hotmail address. Does anyone
know what this might be? maillog shows:
relay=mail6.hotmail.com. [], stat=Sent
so it's a different address. Can someone explain this to me?
Does the hotmail host "answer" from a different IP address?


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