The unique characteristics of a LEO satellite global email communication network have been identified. A new type of network system architecture optimized for the LEO satellite email network is proposed, in which the LEO satellite is designed as an active switching node using a specifically designed LEO satellite network addressing mechanism. New LEO channel optimization algorithms are also proposed to better use the up/down link resource. Comparing to the current design of the system in which the satellite works as a mailbox, a fifty percent performance improvement can be expected.