Patent ID: 7437558
Filing Date: 2008-10-14
Classification: H04L

Abstract:
1. A method comprising: receiving an electronic mail message at a recipient server, the electronic mail message comprising a signature and a key identifier, said signature identifying a domain from which said electronic mail message originated and said key identifier for verifying said signature; accessing a domain name system over a network by the recipient server to perform a domain name system (DNS) lookup responsive to receiving the electronic mail message at the recipient server, the DNS lookup to locate a key registration server associated with the domain; accessing, by the recipient server, said key registration server over the network responsive to receiving the electronic mail message at the recipient server, the key registration server to verify an association of said key identifier with the domain in the signature of the received electronic mail message; and receiving, at the recipient server, a security rating associated with the domain or sender of the received electronic mail message from a rating service, where the security rating is based on at least one of registration policies associated with the domain, domain security, or behavioral information associated with the sender of the electronic mail message.