Email Security Analysis of dev-null.biz
Complete verification of dev-null.biz's SPF, DKIM, DMARC, and MTA-STS records. Find out if this domain is protected against email spoofing.
Last updated: April 15, 2026
SPF
OKv=spf1 redirect=icloud.com include:_spf.google.com ~allDKIM
OKSelectors: googleDMARC
OKv=DMARC1; p=reject; rua=mailto:80691a841ee046a68b30badb52fae41c@dmarc-reports.cloudflare.net,mailto:s.lorenzo+DMARC_REPORT@dev-null.biz; pct=100; adkim=s; aspf=sMX
OKaspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt4.aspmx.l.google.com, alt3.aspmx.l.google.comRecommendations
1Add MTA-STS to enforce TLS encryption for incoming emails
Without MTA-STS, an attacker performing a man-in-the-middle attack can downgrade the connection between mail servers to plaintext, intercepting emails in transit. MTA-STS tells sending servers to only deliver via TLS with a valid certificate, preventing downgrade attacks.
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Analyze dev-null.biz liveGuides to understand these results
SPF Guide
Understand how SPF defines which servers are authorized to send emails for a domain.
DKIM Guide
Discover how DKIM cryptographically signs your emails to guarantee their authenticity.
DMARC Guide
Learn how DMARC orchestrates SPF and DKIM to protect your domain.
MTA-STS Guide
Learn how MTA-STS enforces TLS encryption to protect your emails in transit.
SPF vs DKIM vs DMARC
Compare the three protocols and understand how they work together.