STEP 1
Click on the Tools menu and select E-mail Accounts
STEP 2
Select View or change existing e-mail accounts then click Next
STEP 3
Click on your account then click on Change
STEP 4
Click in the User Name box and add @valkyrie.net if it's not already there then click Next
STEP 5
Click Finish
STEP 6
Repeat steps 1 through 5 for any additional accounts you have that need changed
You're Finished!