SPF · Sender Policy Framework
Declares which servers are allowed to send email from your domain.
DNS tools
Domain Health
Check whether a domain is protected against spoofing and phishing. A grade, a diagnosis per record and fixes you can act on — SPF, DKIM and DMARC at a glance.
DKIM · DomainKeys Identified Mail
Signs every message with a cryptographic key, so its origin can be proven.
DMARC · Policy & Reporting
Tells receiving servers what to do with messages that fail SPF or DKIM.
Overall grade A–F
SPF 35 pts · DKIM 25 pts · DMARC 40 pts — a weighted total out of 100.