URL comparison with a block-list SHOULD be enabled.

Why This Matters

URL comparison with a block-list is a critical security control that prevents users from accessing known malicious or inappropriate websites. Without this feature enabled, your organization remains vulnerable to phishing attacks, malware downloads, and data exfiltration through dangerous URLs. Enabling this check ensures Exchange Online actively compares URLs against a block-list, reducing the risk of a successful attack.

What Aether365 Checks

This security check verifies that Exchange Online is configured to compare URLs against a block-list. It appears in the Aether365 dashboard under your Microsoft 365 security checks to confirm this phishing protection is active.