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How do I enable SMTP Authentication in MS Outlook Client?

Open Outlook.

From the Tools menu, select Email Accounts.The Email Accounts box appears.

Verify that the circle-box View or change existing email accounts is selected and click Next.

Your email account appears usually labeled mail. domain.com.

Click on your Domain email account, usually labeled mail.domain.com, and click the Change button on the right. The Internet Email Settings appear.

Under the Server Information section, in the box marked Outgoing mail server (SMTP), change the entry to mail.domain.com

Click the button More Settings... in the lower right-hand corner. The Internet Email Settings box appears.

Click the Outgoing Server tab.

Click the circle-box My outgoing server (SMTP) requires authentication, and verify that the circle-box Use same settings as my incoming mail server is selected.

Click OK to close the Internet Email Settings box.

IMPORTANT: Do NOT use the "Test Account Setting..." button to test the settings. This will fail.

Click the Finish button to close the Email Accounts box. SMTP authentication has now been enabled.

To test the account, you may send an email to your email address.