1. In Snow Management and Configuration Center (SMACC), go to Configuration > System Core Settings.

2. Review the SMTP_* settings and verify that the configured SMTP details are correct.

   

3. Work with your Exchange or email administrator to verify the following:

   • The SMTP account credentials are correct.
   • The SMTP server and port are correct.
   • The required SSL or TLS settings are configured correctly.
   • If using Microsoft 365 or Exchange Online with authenticated SMTP, verify that SMTP AUTH is enabled for the sending mailbox and is not disabled by the organization’s configuration.

4. After correcting the SMTP or authentication settings, retry the notification.

5. Review the Notification Delivery log and confirm that the 5.7.57 Client not authenticated to send mail error no longer occurs.

NOTE: If you use Microsoft 365 or Exchange Online, SMTP authentication requirements are controlled by your Microsoft 365 configuration. Your Exchange administrator may need to verify that the sending account and authentication method are permitted.

Fix issues with applications that send email using Microsoft 365