Blog articles

Deep dives, updates, and stories about DMARC, SPF, DKIM, and email authentication best practices. Stay up to date on how to keep your email secure and deliverable.

DKIM2 vs DKIM ^{Newest article}

DKIM2 draft is here

DKIM has been the backbone of email authentication since 2007. Nearly two decades later, its limitations are becoming impossible to ignore: forwarded emails break signatures, replay attacks exploit signed messages at scale, and mailing lists routinely cause...

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Latest articles

Die erste deutsche dedizierte DMARC-Plattform

Gebaut für MSPs. Hosted in Deutschland. DSGVO-konform by Design.

Wer als Managed Service Provider oder IT-Dienstleister in Deutschland DMARC für seine Kunden betreibt, hat bisher eine Wahl getroffen, die kaum jemand bewusst getroffen hat:... read more

DMARC Built for Europe. Hosted in Germany.

DMARC for European Businesses: Why Where Your Data Lives Matters

Built in Germany. Hosted in Europe. Fully GDPR-compliant. If you are an IT manager, MSP, or IT decision-maker in Europe looking for a DMARC solution that does not route your... read more

Understanding DMARC Reports

Everything You Need to Know About DMARC Aggregate and Forensic Reports

If you own a domain, you have no visibility into who is sending emails in your name, unless you've set up DMARC. Without it, anyone can spoof your domain and you'd never know.... read more

Der deutsche Bundestag hat ein Spoofing-Problem

81 % der Bundestagsmitglieder können per E-Mail imitiert werden

Eine Analyse von DmarcDkim.com untersucht 555 E-Mail-Domains von deutschen Parlamentsmitgliedern und stellt fest, dass die große Mehrheit keinen wirksamen Schutz gegen... read more

Top 7 SPF Check Tools Compared 2026

Which one actually catches the hard problems?

SPF records break in subtle ways. A missing DNS lookup, a circular include chain, or an empty third-party record can silently cause email authentication failures, and most... read more

Cracking a 1024-bit DKIM Key

Cost, Timeline, and Why It's Closer Than You Think

Your DKIM public key is sitting in DNS right now. Anyone can read it. If you're still using a 1024-bit RSA key, the question isn't whether it can be cracked. It's how much it... read more

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