Ans- Incoming mail server is a server that stores all your incoming messages before it reaches to your inbox. Well, to explain more simply, imagine the server as your friend who is the only connection between you and your other friends. So, whenever your friends want to tell you something it always has to go through this one friend. And this one friend has also a tough task to do. He has to keep all the secrets that your friend wanted you to know safe until it reaches you. So is the incoming mail server.