This error message is usually received when SMTP Authentication is not enabled in the Outgoing Server Settings in your Email Client.

Below are instructions on how to configure SMTP authentication across various email applications.

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Microsoft Outlook 2010

1. Click the File tab.
2. Click Account Settings, and then click Account Settings.
3. Select the account for which you want to change settings.
4. Click More Settings
5. Select Outgoing Server tab
6. Tick the box for “My Outgoing Server (SMTP) requires Authentication”
7. Ensure the option “use same settings as incoming server” is selected (default)
8. Click OK, then Next, and then Finish.

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1. Click Tools.
2. Click Email Accounts.
3. Click View or Change Existing Email Accounts.
4. Click Next.
5. Double-click on the email account you wish to change.
6. Click on More Settings and then click the Outgoing Server tab.
7. Verify that “My outgoing server SMTP requires authentication” is checked and “Use same settings as my incoming mail server is selected”.
8. Click OK, then Next, and then Finish.

1. Click Tools.
2. Click Account Settings.
3. Click Outgoing Server from the left.
4. Select the outgoing server.
5. Click the Edit button.
6. Verify that Username and Password is checked.
7. Verify the username is entered correctly.

1. Click Mail.
2. Click Preferences.
3. Click on the email account you wish to change.
4. Click the Account Information button.
5. Click the Server Settings button.
6. Verify that Authentication is set to Password.
7. Verify that username and password are entered correctly.

1. Click Tools.
2. Click Accounts.
3. Click Mail.
4. Click on the email account you wish to change.
5. Click Account Settings.
6. Click the Advanced Sending Options button.
7. Verify that “SMTP server requires authentication” is checked and “Use same settings as receiving mail server” is selected.
8. Close the window by clicking the box in upper-left corner.