I recently received an email from a collaborator in which I was the BCC (Blind Carbon Copy). The original "To:" recipient was another collaborator who has a very similar email address to mine. Because of the similarity in addresses, and because I didn't see anything indicating I was a BCC (even in the detailed header information), I responded back to the original sender and the "To:" recipient pointing out the "mistake."
Obviously this defeated the whole purpose of being BCC'ed by the original sender.
Is there a way in Mail.app to show if I am the BCC of an email? I am not interested in seeing other BCC's on emails I receive. This was on Lion, if that makes any difference.