G_Smitty - 5:42 pm on Mar 9, 2006 (gmt 0)

Verified Opt-in- The Recipient has verifiably confirmed permission for the address to be included on the specific mailing list, by confirming (responding to) the list subscription request verification. This is the standard practice for all Internet mailing lists, it ensures users are properly subscribed from a working address and with the address owner's consent.

I have personally never received a verified Opt-in-. I have never given permission nor signed up, yet I still receive tons of spam from legitimate companies saying that I have signed up.