Information common to multiple e-mail messages (called common content "chunks") is separated from the individual e-mail messages before transmission. The chunks are then transmitted separately from the individual e-mail message information, and reassembled into a complete e-mail message at the receiving...http://www.google.de/patents/US6044395?utm_source=gb-gplus-sharePatent US6044395 - Method and apparatus for distributing personalized e-mail
