Forum Discussion
Security Admin Center Tenant Allow/Block List Not Able to Block IPv4?
While using the Security Admin Center Tenant Allow/Block List we have been able to block specific email addresses and IPv6 IP addresses but are unable to block IPv4 IP addresses. We have tried both u...
It is AUG 2026 and this issue persists. We are unable to protect our tenant from a large number of phishing and impersonation emails because we cannot block IPv4 and microsoft does not honor the REJECT spf options.