[Exim] btinternet.com mystery

I must be missing something here! Please enlighten me.

I have a few bounce messages on my exim queue which have been sitting there for over
24 hours. They are all addressed to ukgenetics.rm@??? and the message
logs give:

btinternet.com [216.102.246.27]: Connection timed out

It seemed odd to me that btinternet would be timing out and I looked up the MX
records for btinternet.com, tried an smtp telnet connection to both with no problem.
The mystery is why exim is logging [216.102.246.27] when my DNS lookup returned
[194.73.73.117] and [194.73.73.118] as the addresses for the MX hosts (stargate and
moongate.btinternet.com). There is no reverse entry for [216.102.246.27].

Phil.
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Phil Chambers (postmaster@???)
University of Exeter