Email Security Analysis of fastmail.com
Complete verification of fastmail.com's SPF, DKIM, and DMARC records. Find out if this domain is protected against email spoofing.
Last updated: April 2, 2026
45D
This domain is vulnerable to spoofing
MX
OKin1-smtp.messagingengine.com, in2-smtp.messagingengine.comRecommendations
- 1Change your DMARC policy from p=none to p=reject to block spoofing
- 2Harden your SPF by replacing ~all with -all (hardfail)
- 3Enable DKIM in your email provider and add the public key to your DNS zone
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Analyze fastmail.com 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.
SPF vs DKIM vs DMARC
Compare the three protocols and understand how they work together.