Forum Discussion
Exchange ATP SafeLinks - Blocking sites not in the block list
Check safe links policies in Exchange online admin center. You may have modified the default policy, or created a new custom policy, maybe blocking "potentially malicious URLs"
We do indeed check against the list of potentially malicious URLs, and prevent clickthough, but the URLs being blocked are not in that list (even when I parse the wildcards to ensure it isn't matching a poorly written entry by accident). I can't figure out why they are being blocked. Most are fine, just this one set, all connected to a specific organisation (who publish transportation industry newsletters).
Odd!
Please take into account that blocked URLs in the Default policy, are not the same as "Potentially malicious URLs" option that appears in custom policies (a different list of policies, at the bottom of the page). The latter uses URL Detonation, threat intelligence Technology:
In custom policies, you can block "Potentially malicious URLs" and then whitelist the URLs that you want.
