zendesk.com email security: SPF, DKIM & DMARC
Is zendesk.com spoofable? See zendesk.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 ip4:103.151.192.0/23 ip4:104.43.243.237 ip4:149.97.173.180 ip4:163.116.128.0/17 ip4:170.10.128.0/24 ip4:170.10.129.0/24 ip4:170.10.132.56/29 ip4:170.10.132.64/29 ip4:170.10.133.0/24 ip4:18.194.95.56 ip4:18.198.96.88 include:_spf1.zendesk.com ~allDKIM
OKSelectors: k1, mandrill, s1, s2, zendesk1, zendesk2DMARC
OKv=DMARC1; p=rejectMX
OKus-smtp-inbound-1.mimecast.com, us-smtp-inbound-2.mimecast.com, aspmx.l.google.com, alt2.aspmx.l.google.com, alt1.aspmx.l.google.com, aspmx2.googlemail.comRecommendations
1Add rua=mailto:dmarc@yourdomain to your DMARC to receive reports
Without DMARC reporting (rua=), you have no visibility into who is sending email on behalf of your domain. Aggregate reports let you detect spoofing attempts, identify misconfigured legitimate senders, and confidently tighten your policy over time.
2Add 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 zendesk.com, run a live analysis.
Analyze zendesk.com liveFrequently asked questions about zendesk.com
Is zendesk.com spoofable?
No. zendesk.com is protected against email spoofing with a robust configuration. Email security score: 85/100 (grade B).
Does zendesk.com have an SPF record?
Yes, zendesk.com publishes an SPF record (~all qualifier).
What is zendesk.com's DMARC record?
zendesk.com publishes a DMARC record (_dmarc.zendesk.com) with a p=reject policy.
Does zendesk.com use DKIM?
Yes, DKIM signatures were detected for zendesk.com.
Want to test another domain? Run a free email spoofing test.
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.