Abstract
E-mail services are essential in the Internet. However, the basic e-mail architecture presents problems that opens it to several threats. Alternatives have been proposed to solve some problems related with e-mail services, offering reliability and scalability to those systems. This work presents a distributed trust model, allowing to create dynamic and decentralized trusted server lists, through the exclusion of servers used as spreaders of malicious messages. Many techniques were used to build it, like a social network model, message filters, message management, and a trust information storage and propagation model.