Multiple BCC deliveries to one host require an equal number of distinct
SMTP sessions, since the BCC recipient is specified via the envelope RCPT
TO: and that can only be one address, correct? Therefore, this header
could be named X-Original-BCC (or somesuch) and applied in the case that
the envelope recipient does not match any of the To or Cc addresses.
Nope, you can have multiple RCPT TO lines. And you wouldn't want to put the "X-Original-BCC" line in the message, because if you had multiple bcc recipients on the same host, they'd be able to see the other bcc recipients. (Assuming the MTA has one instance of the message and a separate control file listing the deliver-to's.)
best, Jeff
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