TO EDIT YOUR SETTINGS IN WINDOWS 8 MAIL (IMAP)
In the Mail app, swipe from the right-hand bezel of the display towards the centre to bring up the Charms bar, and tap Settings at the bottom.
Underneath Settings, tap Accounts.
Underneath Accounts, tap The account you want to edit
Scroll Down until you come to User Info and Server Details
The following amendments need to be made
|Incoming Mail Server|
|TO:||Your email address or the username configured in your CP.|
Tip – keep the username the same – and simply add "@yourdomain.com" to it.
|Outgoing Server requires Authentication :|
|Use the username and password to send and receive email|
Click the Back button in the settings tab to save the changes