openclassrooms.com email security: SPF, DKIM & DMARC
Is openclassrooms.com spoofable? See openclassrooms.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:mailgun.org include:_spf.salesforce.com include:mail.zendesk.com include:_spf.google.com ip4:54.174.16.18 ip4:52.201.1.182 ip4:34.206.74.100 ip4:35.156.188.4 ip4:35.156.118.121 ip4:35.158.156.37 ip4:18.195.44.92 ~allDKIM
OKSelectors: google, k1, zendesk1, zendesk2DMARC
OKv=DMARC1;p=reject;sp=reject;pct=100;rua=mailto:dmarc@openclassrooms.com; ruf=mailto:dmarc@openclassrooms.com;MX
OKsmtp.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
The results above are updated daily. For an instant check of openclassrooms.com, run a live analysis.
Analyze openclassrooms.com liveFrequently asked questions about openclassrooms.com
Is openclassrooms.com spoofable?
No. openclassrooms.com is protected against email spoofing with a robust configuration. Email security score: 90/100 (grade A).
Does openclassrooms.com have an SPF record?
Yes, openclassrooms.com publishes an SPF record (~all qualifier).
What is openclassrooms.com's DMARC record?
openclassrooms.com publishes a DMARC record (_dmarc.openclassrooms.com) with a p=reject policy.
Does openclassrooms.com use DKIM?
Yes, DKIM signatures were detected for openclassrooms.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.