>is the difference between an email being a 'BCC' or 'envelope only' in
>just the concept and not the execution ??
Bcc can be implemented by changing the envelope address only. On some
MUAs like MH Bcc does more, it marks the copy prominently as a Bcc.
Given that most spam have To: lines which are totally bogus, I would say
there is no primary recipient in such cases. The spam victim *is* the
primary recipient.
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