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It must have been someone else on the email sig; I haven't
posted there recently.

Thanks for the workaround.  However, it only fixes the
problem for MIME messages, but not for non-MIME messages. 
The second message constructed in my test script still lacks
a trailing newline.

I can work around it after the message is generated by
checking for a final newline on the string and adding it if
it's missing, but that seems clunky.