Ben,
It is highly unlikely that EXIM is doing anything to your
attachment as Exim treats attackements as raw data and just sends it
along ... unless you have somthing in your config that does... What do
you logs say? are you running anykind of content scanning on out-bound
messages? Can you have your sending server send to a local account on
the exim box? and download it with thunderbird from that account?
What kind of server is sending the message with what command?
Basicly you have asked a valid question but have not provided any
datails to assist with providing any "real" answer...
more detail better answers ...
Kevin
--
kmb
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