mailbox.org email security: SPF, DKIM & DMARC
Is mailbox.org spoofable? See mailbox.org's SPF, DKIM, DMARC and MTA-STS records and find out if this domain is protected against email spoofing.
Last updated: August 9, 2026
SPF
OKv=spf1 ip4:213.203.238.0/25 ip4:195.10.208.0/24 ip4:91.198.250.0/24 ip4:80.241.56.0/21 ip6:2001:67c:2050::/48 mx ~allDMARC
OKv=DMARC1; p=reject; adkim=r; aspf=r; pct=100; rua=mailto:abuse+arf@heinlein-support.de; rf=afrf; fo=1;MX
OKmx3.mailbox.org, mx4.mailbox.org, mx2.mailbox.org, mx1.mailbox.org, mx-n.mailbox.orgMTA-STS
OKv=STSv1;id=20261606010000Recommendations
1Enable DKIM in your email provider and add the public key to your DNS zone
DKIM adds a cryptographic signature to your emails, proving they haven't been tampered with in transit and genuinely originated from your domain. Without it, attackers can forge emails that pass basic checks, and your legitimate emails are more likely to land in spam.
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<a href="https://spoofchecker.online/en/email-security/mailbox.org" target="_blank" rel="noopener"><img src="https://spoofchecker.online/api/badge/mailbox.org?score=75&grade=B" alt="Email security score for mailbox.org" height="28"></a>Frequently asked questions about mailbox.org
Is mailbox.org spoofable?
No. mailbox.org is protected against email spoofing with a robust configuration. Email security score: 75/100 (grade B).
Does mailbox.org have an SPF record?
Yes, mailbox.org publishes an SPF record (~all qualifier).
What is mailbox.org's DMARC record?
mailbox.org publishes a DMARC record (_dmarc.mailbox.org) with a p=reject policy.
Does mailbox.org use DKIM?
No common DKIM selector was detected for mailbox.org among those checked.
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.