1. In Windows Live Mail, right click on your mail account in the left pane. Select ‘Properties’ from the menu.
2. Select the ‘Servers’ tab in the properties window that pops up.
3. Update the ‘email username’ by adding @ your domain name to the end of the existing user name. The below example shows atlashosting.com as the domain, but this is only an example. Use your domain name instead.
4. Press ‘Apply’ then ‘OK’