I think the guy above me means Imap not smtp.
Imap downloads the headers so you see the subject of your mail and you can open it if you wish, which then downloads it to your computer. This is good if you check your mail on multiple computers.
But, since you have 1 email address it would be no use to you really. Not to mention you said you dont want email stored on your computer.
EDIT: Argh! Someone beat me to it!