In the architecture of e-mail, we can have

Q. In the architecture of e-mail, we can have

1. 2 Scenarios
2. 3 Scenarios
3. 4 Scenarios
4. 6 Scenarios

Answer: 4 Scenarios

There are four scenarios most commonly used to exchange the E-MAIL.

1. First scenario
2. Second scenario
3. Third scenario
4. Fourth scenario

First Scenario

When the sender and the receiver of an e-mail are on the same mail server,we need only two user agents.

Second scenario

When the sender and the receiver of an e-mail are on different mail servers,we need two UAs and a pair of MTAs (client and server).

Third scenario

When the sender is connected to the mail server via a LAN or a WAN, we need two UAs and two pairs of MTAs (client and server).

Fourth scenario

When both sender and receiver are connected to the mail server via a LAN or a WAN, we need two UAs, two pairs of MTAs (client and server), and a pair of MAAs (client and server). This is the most common situation today.