sent emails bounce back with error message

Server error: '550 Please configure your mail client to use authentication.'


Answer

Try the following steps and then verify if you’re able to send mails.

1)   Open Outlook

2)   Click on File > Info > Account settings > Account Settings

3)   Click once on your email account and then click on ‘Change’

4)   Now click on ‘More Settings’ > ‘Outgoing Server’ tab

5)   Check the box which reads ‘ My outgoing server requires authentication’

6)   Click OK

7)   Now click ‘Next’ and then on ‘Finish’

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