Quote:
Originally Posted by exaltedwombat
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If I go to my isp's webmail interface, the same file downloads intact.
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This indicates that the problem is not caused by something on the sender's end. It limits the issue to Outlook and/or any Outlook addin. I suspect that it is an Outlook addin that is the issue, quite possibly a virus scanner that is recognizing the epub as being the archive that it is and scanning its contents.