4. The method according to claim 1 , wherein the electronic messaging system resides on a mobile wireless communication device.
4. The method according to claim 1 , wherein the electronic messaging system resides on a mobile wireless communication device. 5. The method according to claim 4 , wherein said searching for the certificate of the recipient based on the match with the recipient address, and said automatically searching for the certificate of the recipient based on the canonical name associated with the recipient address if no match occurs based on the recipient address are conducted on said mobile wireless communication device.