Email is still the No. 1 attack vector, and most domains are one missing DNS record away from being spoofable. Hardening email means getting authentication (SPF, DKIM, DMARC) right, locking down the gateway, and protecting deliverability. This hub links the full workflow.
Email Authentication Validator
Validate SPF, DKIM, and DMARC records with security grading and recommendations
Open the full Email Authentication Validator tool →Loading interactive tool...
The hardening workflow
- Authentication — publish SPF, DKIM, and an enforcing DMARC policy. See SPF, DKIM & DMARC: Email Spoofing Prevention, the Email Authentication Complete Guide, and the step-by-step SPF/DKIM Implementation.
- Gateway — anti-phishing, attachment/URL defense, and TLS. See the Email Gateway Security Configuration Guide and Email Security.
- Deliverability — keep legitimate mail landing. See How to Improve Email Deliverability and the Anti-Spoofing Campaign.
Validate your SPF/DKIM/DMARC records with the tool above before you enforce a reject policy.