Backing up emails and then forwarding them

Hi. I want to have a script that when run backs up all emails in a pop3 mailbox that are from email addresses not in a database. The person who has sent the email will receive an email that asks them to verify the email by clicking a link and then the email is sent. I need to know how to resend the email from the database. I have backed up the full body and the full headers. How can I reconstitute the email and send it as an attached eml file? Many thanks, IG