A Mail Transfer Agent (MTA) is a software that transfers electronic mail messages from one computer to another using a client server application architecture. An MTA is also called by a few other names such as – a Message Transfer Agent, Mail Relay, and Mail Transport Agent.
Some of the popular MTAs in use are Sendmail, Exim, and Postfix.
Fedora and Red Hat Linux distributions by default ship with Sendmail as their MTA. However, switching to another MTA such as Exim or Postfix is quite easy. Continue reading