With MH, extracting information from the header, as constructed by the
user, having a group with no addresses in the user constructed message
would clearly be a useless form ... since the header field is the only
place MH has from which to extract destination addresses, if there are
none present there, the message cannot be sent to anyone.
ISTM that MH's authors took a wrong turn, given their implementation of
bcc and their reluctance to add dcc. This pushed them towards removing
the recipients from a group address. Having a "normal" bcc, or dcc
early on, would have given that second place to put the recipients when
an empty group is wanted for privacy.
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