ABSTRACT
The Message Transfer Agent routes and relays the messages. Its responsibilities include establishing the store-and-forward path, ensuring channel security, and routing the message through the media. An MTA's operation is relatively straightforward. The User Agent sends its message to the local Message Transfer Agent. The MTA checks the message for syntax errors, then delivers the message to a local User Agent, or if the message is not local, it forwards it to the next MTA. That MTA repeats the process until the message is successfully delivered.
