Well, here's the story on what happend to Natalie Maynor's list mail.
 
This week, I decided to install a second SMTP server in improve mail
thru-put here at UGA.  Installing the server was a piece of cake.  Getting
LMAIL to use it wasn't so easy.
 
I have been using John Voigts DOMAIN EXEC to re-write the DOMAIN NAMES
file to replace "INTERBIT SMTP" with "UGA SMTP" for several years now to
use the local gateway instead of sending all my internet traffic somewhere
else.
 
Well, the right answer appeared to be to write a LSM$DNT EXEC exit for
LMAIL to allow me to specify s=smtp,smtpl as I re-write each INTERBIT
tag to UGA.  So, I got a copy of the base exec from Eric, and fixed it
up for my needs.  I realizied that I needed the original, unmodified
DOMAIN NAMES file, so I put it back up.  I then reloaded LMAIL and had
him re-build the DOMAIN TABLE.  Looked at it, and everything was just
fine.  LMAIL was now using both SMTP machines, and all was right in the
world.
 
Wednesday, I was off checking for damage on my sailboat after the big
storm last weekend (nothing worth talking about, although many boats in
the marina were destroyed by huricane force winds.)  When I got back
I saw Natalie's message about her mail going via PUCC.  I didn't think
anything of it at first, but the more I puzzled over what was happening,
the more I decided something was wrong.
 
Seems like LISTSERV was now looking at the unmodified DOMAIN NAMES file
and was sending mail for .edu via INTERBIT.  Oops...  I then coded up
a second exit (LSV$DMT EXEC) for listserv to replace all occurrences of
"INTERBIT SMTP" with "UGA MAILER" and now everything seems to be back to
normal.
 
Hope these ramblings will help prevent anyone else from stepping in this
particular mess.
 
Harold