Eric,

>I think this is it. It was fixed in 15.0:
>
>145-0024 06/09/20 [B] Allow spaces in MIME boundaries

Aha! Thanks for pointing that out. I hadn't perused any 15.0 documentation
yet.

However, my site just updated to 15.0 last Saturday, so I will be watching
for evidence that it corrects the problem. From that description, it seems
likely it does so.

Hal Keen