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Error "Outlook 550 authentication required" - what to do?

  • Dec 23, 2025
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You get with Outlook, the error message "Outlook 550 authentication required", we will show you on the example of Outlook 2010, how to fix the error.

Error "Outlook 550 authentication required" in the account settings

The error message indicates that there is a authentication problem on the outgoing mail server.
  1. Click above in the menu bar, click "file" and then "information".
  2. Go to "account settings" and in the sub-menu again on "account settings".
  3. Double-click on your E-Mail address, then click "More settings".
  4. There you select "outgoing mail server".
  5. Enable the Option "my outgoing server (SMTP) requires authentication" and "use Same settings as my incoming mail server".
  6. You confirm everything with "OK".
  7. Note: in Principle, you can use these instructions for older versions of Office. The menu may be slightly different.
In Outlook add a new account, you will learn in this practical tip.

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