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!