Mail notifications not working - SMTP server does not support authentication

Hi,

I am using legacy TimeXtender 20.10.40.64, and am attempting to set up email notifications for execution package failures.

I have been given the information for the destination (email load balancing relay):
IP: 150.xx.xx.1
Port: 25

The destination firewall supposedly has all necessary ports open, although I don’t have direct access to check this.

When I test the notification, I receive the error “The SMTP server does not support authentication.” (see the picture below).

The app registration on Azure has the following API permissions (all delegated and granted admin consent):

• Microsoft Graph User.Read
• Microsoft Graph Mail.Send
• Microsoft Graph SMTP.Send

I haven’t been able to find any information about the error message and what could be causing it. Any help or pointers for troubleshooting this further would be appreciated.

Best regards,

Pontus