> I've reached these conclusions:
>
> 1) There is still a bug somewhere in the LISTSERV code that generates
> inconsistent MIME boundaries.

The explanation is simple: the fix for this bug was written on 07/12,
whereas 14.4 was released on 06/20.

> 2) This code is not used much.

That is probably true in the general sense - the problem did not surface
during beta. This being said, a particular site can happen to use this code
a lot, whereas another site hardly ever uses it.
 
  Eric