Systems for forwarding an E-mail message to a user when instant messages from a sender cannot be forwarded to a secondary IM processing device comprise a primary IM processing device configured to send and receive E-mail messages and a router configured to route E-mail messages between the primary IM processing device and a sender's processing device. An E-mail user agent is coupled to the router and configured to provide access to E-mail information including an address of the sender such that an E-mail message can be sent to the sender's processing device. The router is further configured to receive notification at the primary IM processing device of a reply from the sender's processing device. Other systems and methods are also provided.