I got the idea of using ( something here ) in the To: header as a way of
refering to
a Dcc or Bcc list of addresses from:
https://serverfault.com/questions/743538/sendmail-support-of-empty-group-addresses-aka-list-syntax
Ralph already answered this, but I will note that when you're using the
"sendmail/pipe" interface you're accepting reduced functionality and
this is part of it (also, you cannot use Dcc: when using sendmail/pipe
or a traditional MH-blinded group address, so I'm not even sure how you
would use this in practice unless you just stick to the MH-style Bcc).
If you're not using sendmail/pipe, this shouldn't be an issue.
--Ken
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