Email Services - Frequently Asked Questions:
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Why can't I send a Microsoft Office document as an attachment to an Exchange account?
If you are getting a bounced email with an error like
#554 5.6.0 STOREDRV.Deliver; Corrupt message content ##rfc822;
it's possible Thunderbird is sending the attachment with the incorrect MIME encoding.
To fix the problem:
- Close Thunderbird.
- Navigate to the following directory based upon your operating system:
Open the directory named with a random set of characters like "yo6luyl8.default". There may be multiple directories if you have multiple Thunderbird profiles.
Delete the file named 'mimeTypes.rdf'.
- Windows 2000/XP: C:\%userprofile%\Application Data\Thunderbird\Profiles
- Windows Vista: C:\%userprofile%\AppData\Roaming\Thunderbird\Profiles
- Mac OS X: /Users/<username>/Library/Thunderbird/Profile
Information Systems and Computing, University of Pennsylvania