While just starting to build www.vintage-at-heart.com I kept getting a warning message (This might not be the site you want):
FYI, you can turn off SmartScreen Filter in Settings>View Advanced Settings and scroll all the way to the bottom and toggle the button.
But of course, that's just a workaround. All I had to do was click the button "Report as safe" and tell Microsoft this is my site and within an hour I got back an email:
Hope that helps someone.