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IIS Relay to O365 with Modern Authentication enabled
I turned on Modern Authentication on our tenant this weekend in preparation for MFA, since then I can no longer relay email from copiers, etc. through the IIS relay with authentication, I do have it ...
I think I finally have it working. I created an In Cloud user with the .onmicrosoft.com address, assigned an exchange license, and setup the send as delegation for the accounts sending as, and it works as it did before I enabled Modern Authentication.
So, you say it is possible to you IIS Relay with modern authentification, it works ?