There are 6 different header options that can be set. Perhaps
one of the other 4 might allow this user to reply successfully?
<abstracted>
Options for mail headers of incoming postings (choose one):
FULLhdr or FULLBsmtp -> "Full" mail headers
IETFhdr -> Internet-style headers
SHORThdr or SHORTBsmtp -> Short (default) headers
DUALhdr -> Dual headers, useful with PC
or Mac mail programs
/Pete