How do I fix Error 554 in Outlook?

How to fix the problem:

1. In Outlook, go to "Tools" and select "Email Accounts". …
2. Click Next. …
3. Select "More Settings".
4. Select "Outgoing Server".
5. Check "My outgoing server (SMTP) requires authentication".
6. Make sure that Use same setting as my incoming mail server is selected.
7. Click "OK", then "Next", then "Finish".