After clicking on Mail Servers you'll see the screen on the left. Under the "Incoming Mail Servers" section it should be blank unless someone had created an account before. We'll get to that in a minute. Under "Outgoing Mail Server" enter the outgoing mail server name your ISP has given to you. The rest of the options should look like the ones on the LEFT.

Once that's entered click on the ADD button under the "Incoming Mail Servers" section.
Click here to continue