Hi @ André Borgeld ,
Allow this website to configure server settings?
According to my search, this warning is a feature of Outlook that retrieves the Autodiscover profile and checks if it is extracted from the correct domain and accepted.
Have you tried selecting the option "Don't ask me again about this website" to see if anything helps?
If you still keep popping up and cannot send and receive emails normally, please refer to the following link to run Test E-mail AutoConfiguration:
Mailboxes - Test E-mail AutoConfiguration - Microsoft Community
(Note: Microsoft provides third-party contact information to help you find additional information about this topic. This contact information may change without notice. Microsoft does not guarantee the accuracy of third-party contact information.)
Also note that run the test after clearing the “Use Guessmart ”check box and the “Secure Guessmart Authentication” check box.
You can also share screenshots under the log tag after masking your personal information for us to research.
Additionally, the official documentation here provides an article that suppress Autodiscover redirect warnings by setting registry values:
How to suppress AutoDiscover redirect warning - Outlook | Microsoft Learn
Hope the above information is helpful to you!
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