"Bcc" (i.e. Blind carbon copy) field allows concealing the identity of the "Bcc" recipient from other recipients of the message.
Unfortunately the message may not contain any straightforward information that might be addressed only to this concealed "Bcc" recipient such as: "Kate - let's accept his offer", "Remind me about it on Monday", "Bob is in charge of this", etc.
BccInfo provides this possibility.
By suffixing the "Bcc" recipient e-mail in the addressing area with "=>" and any short additional information, your "Bcc" recipient will receive the message with this additional information at the beginning of the body of the message.