OK, here's what's going on.
Just got a report from my users that the mailman archiver I'm using -
Pipermail (comes with the package, AFAICT) - is doing weird things.
First half of a message is here:
...and the second half of a message is here:
Note how in this case on the second message there seems to be a line
missing - as near as we can tell, if it hits a paragraph that starts
with the word "From", it cuts off, starts a new archive file, and
eliminates that first line from the new archive file.
What's going on, and how do I fix this?