Question

I need to do this can any one give me a cheap solution. Here is what i need to do.

Sender Assurance - If a sender's email address or domain is not in your address book, you have the option of auto-deleting their messages, or auto-replying with a one-time assurance link. Senders can then add themselves to your address book, by clicking this link and entering a unique code. This safeguards both recipient and sender by making sure someone hasn't forged a sender's email address to forward viruses or automated spam messages.

Outside of getting a program to work with your current mail client, or writing some hefty PHP/MySQL code, I don't know of a way.

Keep us up to date if you find a solution that is economical and effective.