Blog
Product updates, announcements and notes from the grimDMARC team.
What Is the RUA Tag? A Plain-English Explanation
What the RUA tag in a DMARC record actually does, how DMARC aggregate reports work, and how to add more than one rua= address — explained without the DNS jargon.
Everyone Talks About DMARC. Almost Nobody Turns On MTA-STS.
DMARC, SPF and DKIM prove an email is really from you. None of them protect the email once it's in transit. Here's how a man-in-the-middle downgrade attack actually works, and why MTA-STS is the setting that stops it.
p=none Is Like Locking the Door and Leaving the Key in It
A DMARC record with p=none looks like protection from the outside, but it enforces nothing. Here's why 'monitoring mode' quietly leaves your domain wide open — and what it actually takes to lock the door for real.
DMARC for MSPs: Why a Multi-Tenant Platform Beats a Single-Domain Tool
Most DMARC platforms are built for one company protecting one domain. MSPs manage hundreds. Here's why that gap matters, and how grimDMARC is built around the MSP workflow from the ground up.
Why We Built grimDMARC Around Customers, Not Domains
Most email security tools are built around a single domain. MSPs don't manage domains — they manage customers. Here's how that realization reshaped grimDMARC's entire design.
BIMI Explained: Why Some Company Logos Show Up in Gmail (And Yours Might Not)
What BIMI actually is, why only some companies get their logo shown next to their emails, and what it really costs — explained in plain English, no DNS records required.
Our Analyzer Tools in Action: A Real Domain, Real Results
Domain Scanner, SPF Analyzer, DMARC Analyzer and BIMI Analyzer run against a real domain — see exactly what each one checks and what the results actually look like.
Introducing SPF, DMARC and BIMI Builders
New tools to build valid SPF, DMARC and BIMI records from scratch, or validate one you've already written — entirely in your browser.
The BIMI Analyzer Is Live — Our Free Analyzer Suite Is Now Complete
Domain Scanner, SPF Analyzer, DMARC Analyzer and now BIMI Analyzer — a look at all four free diagnostic tools and what the new BIMI check actually verifies.