There is seriously a Bcc conspiracy. I have my default mail set up in
HTML in Outlook 2007. When I send out a new message with a bcc
recipient, I can see it in my sent folder. But when I reply or
forward the same message to another or the same bcc recipient, when I
go to see whom I sent it to in my sent folder, the field disappears
all together.

Who's behind this plot?

By the way, I'm using Gmail and IMAP if that matters.