A Dynamic Routing Method for Inbound E-mail Delivery Considering Route and MTA Conditions on Multihomed Environment

To operate e-mail systems stably multihomed networks are well used. As an operation method on multihomed networks, we have proposed a dynamic route selection method considering status of networks. However, status of Mail Transfer Agents(MTAs) have not been considered in this method so that a heavily loaded MTA would be possibly selected. In this paper, we propose a new dynamic route selection method considering not only status of networks but also that of MTAs. With this method, an appropriate route could be selected based on status of networks and MTAs so that dynamic load balancing of MTAs could be realized. Furthermore in case failed MTAs exist, such MTAs could be avoided automatically.