[Mimedefang] Strange issue with mimedefang/spamassassin reports.

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Addendum (now that you posted the message itself):

Neither your sendmail nor MimeDefang are the most current releases.  You should upgrade both packages and see if the problem is still present.

Sendmail:  8.14.3  (you have 8.14.0, and an 8.13 configuration)
MimeDefang: 2.67   (you have 2.64)   2.68 has a beta version out.

It's always possible that your result is based on some behavior that has been fixed by later versions.