That's good research, and good work. And I agree with the conclusion you implied:
> If you use MIMEDefang (which uses MIME::Tools), you may want to > unconditionally call action_rebuild in filter_begin(). This > forces the MIME message to be rebuilt by MIME::Tools, resulting in > a valid MIME message. That's the only approach that offers promise of settling this class of problems. Do MIME::Tools and/or MIMEDefang know about the punctuation marks that some Windows MUAs silently ignore in filename extensions? How about charset canonicalization, non-default (incorrect but commonly accepted) UTF-8 encodings? -Bennett
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