Jane:
It sounds like the ISP's methods are B.A.D. -- broken as designed.
There are a couple of LISTSERV subscriber options that affect the appearance of
the RFC822 headers (and L-Soft has already mentioned some list defintion
keywords).
SET listname FULLHDR or IETFHDR or SHORTHDR or DUALHDR or SUBJECTHDR
These won't affect MAIL FROM.
<rhetorical>
LISTSERV(R) has been working very nicely [stood the test of time] for 2 decades.
I wonder how long this ISP will be in business?
I would be glad to approve a C/R if they paid me $100 (or Euros) for each.
/P
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Pete Weiss