Currently receiving the following message:
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 [LO2P265CA0276.GBRP265.PROD.OUTLOOK.COM]
I was previously using Azure AD Baseline Polices and recently transitioned to Security Defaults as directed by Microsoft due to Baseline Polices being phased out. Essentially this means I need to use app passwords for non-MFA compatible connections such as SMTP. This was working fine pre security policy change using app passwords, but hasn’t worked since. I have tried generating a new app password, but it’s still not working.
I’m curious about the ‘anonymous mail’ part, could you shed some light on this?