US Patent 7685639 Using inserted e-mail headers to enforce a security policy

An outgoing e-mail manager inserts headers into outgoing e-mail messages originating from at least one source on a computer. Each header includes data concerning the source of the e-mail. An e-mail header manager monitors an e-mail stream, and reads headers inserted into e-mail messages. The e-mail header manager applies a security policy to e-mail messages, responsive to the contents of the inserted headers.