A method for providing add-on services responsive to an email transferred via a distributed computer network. The method includes receiving via the distributed computer network the email at an add-on service system. The method further includes ascertaining from the email whether a recipient of the email...http://www.google.com/patents/US7401122?utm_source=gb-gplus-sharePatent US7401122 - Techniques for providing add-on services for an email system
