> >It is interesting! This LSTOWN-L list does not contain such text
> >in To: field! How this is possible?
>
> A change was made for LISTSERV 1.8d (which LSTOWN-L runs under).  Your LISTSERV
> is either 1.8c or even perhaps 1.8b.  This change is due to a different version.
> It is still hard-coded and not configurable.

I believe that the "Multiple Recipients of" text was eliminated in
LISTSERV 1.8c, not 1.8d.  But if the version of LISTSERV that he has
supports the IETFhdr option, that would be a way to get rid of the
text.