The SENDER: line looks strangely like something other than a
normal list distribution.  On a VM/CMS LISTSERV (to a remote test
address), I have tried DUALHDR distributions.  The SENDER: shows
the name of the list, not 'LISTSERV' both in the RFC822 and
body-of-text (dualhdr).
 
Looking at your archives (not a REAL distribution), I see "good"
fields.  The list's definition can also override default LISTSERV
behaviour via the * SENDER= keyword.
 
Finally I believe there is a global LISTSERV config option (but
can't remember) for certain kinds of outputs associated with
commands.
 
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