Answer
In the context of email, blind carbon copy (BCC) means that the message is sent to multiple recipients in such a way that the email does not contain the complete list of recipients.
This means that the BCC information will therefore not be in the message body or header that arrives for the To: or CC: recipient's POP3 mailbox, making it impossible for GFI MailEssentials POP2Exchange to route the email to BCC recipients.