BAD MSG:
mailing-list which a message came from was clearly specified
n a separate header. This would also make mail and news more
similar, since news already has such a header, "newsgroups".

I suggest, however, that the name of the new header be
one of the following:

Mailing-List
Group
Mail-Group

Group and Mail-Group will easily associate with the existing
Newsgroups header in the user's mind.

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Jacob Palme <jpalme@dsv.su.se> (Stockholm University and KTH)
for more info see URL: http://www.dsv.su.se/~jpalme