Here's the how to for fixing your email on Outlook:

  1. On the Tools menu, click "E-mail Accounts", or "Account settings" depending on your version of Outlook.
  2. Select View or change existing e-mail accounts, and then click Next.
  3. Select the name of the e-mail account, and then click Change.
  4. Click More Settings.
  5. On the Outgoing Server tab, verify that the "My outgoing server (SMTP) requires authentication" check box is selected.
  6. Click "OK" or "Apply".