corrupt e-mail attachments

F

floatpc

I have a network where recepients over the Internet receive corrupted
attachments from us. We run Outlook client with Exchange 5.5. It is an
intermittent but persistent problem where attachments (e.g. Word of PDF) are
received as corrupted files with a changed file extension ( usually .dat,
Binary? ). Is this a virus? Software? Has anyone ever seen this problem? The
situation is starting to reach critical mass.
thanks
 
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