Dynamices 365 FO : error "the smtp server requires a secure connection or the client was not authenticated

trying to send test mail through the email parameters in dyn365FO VHD.

Its give error "the smtp server requires a secure connection or the client was not authenticated. The server response was 5.7.57 SMTP; client was not authenticated to send anonymous mail during MAIL FROM"

Any suggestions???

Solution :

Try using same email to login to  DynFO which you configured in smtp setup. If this works go to office email portal and enable 'send as' .