Hello Team,

We are unable to send emails to our clients through zoho support.We are getting the below issueError while processing the request! Unable to connect SMTP server:outlook.office365.com Reason:Authentication failed:535 5.7.3 Authentication unsuccessful.

Please note that we have not made any recent changes, and it was running fine and we suddenly started receiving this error.

Could you please look into it and assist?

Regards,

Sridinesh Kolluru