anthropic.com email security: SPF, DKIM & DMARC
Is anthropic.com spoofable? See anthropic.com's SPF, DKIM, DMARC and MTA-STS records and find out if this domain is protected against email spoofing.
Last updated: June 3, 2026
SPF
OKv=spf1 include:_spf.google.com ~allDKIM
OKSelectors: googleDMARC
OKv=DMARC1; p=reject; sp=reject; rua=mailto:f0cef134490d4d43b9c134fc3c2a3481@dmarc-reports.cloudflare.net,mailto:dmarc-reports@anthropic.com; ruf=mailto:dmarc-reports@anthropic.com; fo=1MX
OKaspmx.l.google.com, alt2.aspmx.l.google.com, alt1.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.
Run a live analysis
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Analyze anthropic.com liveFrequently asked questions about anthropic.com
Is anthropic.com spoofable?
No. anthropic.com is protected against email spoofing with a robust configuration. Email security score: 90/100 (grade A).
Does anthropic.com have an SPF record?
Yes, anthropic.com publishes an SPF record (~all qualifier).
What is anthropic.com's DMARC record?
anthropic.com publishes a DMARC record (_dmarc.anthropic.com) with a p=reject policy.
Does anthropic.com use DKIM?
Yes, DKIM signatures were detected for anthropic.com.
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Guides 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.