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.

Understanding DMARC Reports Newest article

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. DMARC reports fix that. They're automated summaries sent to you by mail providers...

Read full article

Latest articles

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

Manual DMARC Monitoring vs Automated Monitoring

A practical comparison of cost, visibility, risk, and operational ownership in modern email authentication

Most organizations treating DMARC as a set-and-forget task are operating blind. Here is what that actually costs, and why automated monitoring is not a nice-to-have. In this... read more

🇩🇪 Welche Hosting Anbieter unterstützen DMARC

Welche Hosting Anbieter DMARC standardmäßig unterstützen und worauf Sie achten sollten

DMARC ist kein Feature, das ein Hosting Anbieter „aktiviert“. DMARC ist ein DNS basiertes Protokoll, das der Domain Inhaber selbst veröffentlicht. Trotzdem gibt es große... read more

SMTP Smuggling

How a Subtle SMTP Parsing Flaw Enables Global Email Spoofing

SMTP smuggling is a newly identified email spoofing technique that exploits inconsistencies in SMTP parsing. Learn how it works, why it matters, and what organizations should do... read more

Is your domain really protected?

Enter your domain to run a live DMARC check and see how easy it for others to spoof your domain.

No sign-up required. Safe to try on any domain.