Email Security Analysis of protonmail.com
Complete verification of protonmail.com's SPF, DKIM, and DMARC records. Find out if this domain is protected against email spoofing.
Last updated: April 2, 2026
75B
This domain is protected against spoofing
DKIM
OKSelectors: protonmail3MX
OKmail.protonmail.ch, mailsec.protonmail.chRecommendations
- 1Upgrade your DMARC policy from p=quarantine to p=reject for full blocking
- 2Add rua=mailto:dmarc@yourdomain to your DMARC to receive reports
- 3Harden your SPF by replacing ~all with -all (hardfail)
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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.
SPF vs DKIM vs DMARC
Compare the three protocols and understand how they work together.