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I think this specific problem (labeled "biggest problem"
above) is fixed in the folding-reimpl-branch, which will
soon be merged to email 2.5 on the python 2.3 trunk (and
likely backported to python 2.2.3).

Both bugs 594893 and 675420 are still open so I will respond
to those on those bug reports.

As for the other problems alluded to in this report, please
submit separate bug reports for them, and assign them to me.
 Be sure to upload (not paste as a comment) sample code that
illustrates the bug.  If the bugs still exist, I will want
to add them to the test suite.