The long lines are being produced by a bespoke C process,
running on Solaris, and the data is EDIFact formatted. These output
files are fine up until the point I call "mhmail" and by the time it
gets through our Exchange gateway it comes back with exclamation marks
in it ~every 998 characters.
Okay, so I sat down and generated a long-lined message and fed it
into mhmail and watched the SMTP network traces with tcpdump ...
and it's just as I thought - we're not doing any line breaking.
What you send is exactly what you get. The message does get broken when
I receive it (at column 1024, though). So it ain't nmh doing the line
breaking; it's one of the SMTP servers in your path.
We _should_ be doing some kind of line breaking, though ... as others
have pointed out, sending a line greater than 998 columns is not valid
according to the SMTP specification. But anyway, we aren't putting those
exclamation marks in there; that's someone else.
--Ken
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