IPs in the connection filter allow list bypass Defender for Office's spam/phish/malware scanning entirely. Large ranges, stale entries, or Microsoft's bulk-sender 'SafeList' create permanent backdoors past your email security.
A scan reports where your tenant stands on this check — pass, fail with a step-by-step fix, or not applicable if your licensing doesn’t include the feature. When Tenant Strike can’t read a setting with read-only access, it says unverified and gives you a one-command way to confirm it yourself — it never guesses.
Check your own tenant
Is your tenant covered on "keep the ip allow list narrow"?
One read-only scan answers it — this check and every other one in the catalog, each with a plain-English fix. 7-day Pro trial, no credit card.