Abstract: A method and system for routing email messages to a recipient across disparate communication networks, by addressing the recipient using a pre-assigned alias. The alias may be an alphanumeric identifier that is associated with the recipient device, or a nickname that is associated with an alphanumeric identifier that is associated with the recipient device. The alphanumeric identifier is network independent across carrier networks, such as the recipient's wireless phone number or a nickname. The sender addresses an email message using the alias to a messaging server, without having prior knowledge of the wireless carrier dependent syntax for email addressing the recipient. The messaging server determines the corresponding wireless network carrier that services the recipient's particular recipient as identified by the alias, and the appropriate wireless network dependent syntax for email messaging to the recipient.