Email Security Checker
Analyze email authentication configuration. Validate SPF, DKIM, DMARC and check 50+ RBL/DNSBL blacklists.
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Email Authentication Protocols
SPF
Sender Policy Framework - TXT record specifying which IPs/hosts are authorized to send email for your domain. Max 10 DNS lookups.
DKIM
DomainKeys Identified Mail - Cryptographic signature to verify email integrity and authenticity. RSA/Ed25519 key published via DNS.
DMARC
Domain-based Message Authentication, Reporting & Conformance - Policy defining how receivers should handle SPF/DKIM failures.
RBL/DNSBL
Real-time Blackhole Lists (RBL/DNSBL) - DNS-based databases of IPs/domains reported for spam. Checked against 50+ lists.
MTA-STS
Mail Transfer Agent Strict Transport Security - Enforce TLS encryption for SMTP connections via DNS policy.
BIMI
Brand Indicators for Message Identification - Display your brand logo in email clients. Requires DMARC p=quarantine or p=reject.
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