[Mailman-Users] Can't hide sender of message

[Stephen J. Turnbull]

Mark Sapiro writes:

 > I.e. it is sent twice to different spellings of
 > bulletin-editor at lincolnschoolpta.net which may account for your have
 > received 3 copies because MTAs should consider
 > Bulletin-Editor at lincolnschoolpta.net and
 > bulletin-editor at lincolnschoolpta.net to be separate recipients.

>From the "But that's *stupid*" department:

N.As I'm sure Mark knows, distinguishing case in mailboxes is a
deprecated practice, and local mail delivery systems are strongly
encouraged to avoid it.  Nevertheless, the practice *does exist*, and
therefore originating and intermediate MTAs *must* distinguish those
addresses, and forward to all of them.  The originating MTA cannot
know what the ultimate destination's policy is, and it must not guess.