Mac OS X - Changing User Name

1. Open up System Preferences and select Network.
2. Click on the PPP tab, and you should see the screen below.
3. In the Account Name block, you should see your usual user name. Just add the "@presys.com" and click on Apply Now, in the bottom right of the window. Quit the System Preferences.
4. Next start up Mail.
5. Under the Mail menu, select Preferences. You should see the window below (without the OregonFast description).
6. Click on Edit. You should see the window below.
7. In the User Name block, add "@presys.com"
8. Click on OK.
9. Try sending and receiving mail.