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Email authentication, in plain English
No jargon, no fear-mongering. What these records do, what they don't, and why the rules changed.
What is DMARC? (in plain English)
DMARC explained without jargon: what it does, why Google, Yahoo, and Microsoft now require it, and how to check your own domain in 10 seconds.
p=none vs p=reject: the difference between watching fraud and stopping it
Most domains with DMARC are at p=none — which blocks nothing. The difference between monitoring and enforcement, explained for business owners.
SPF, DKIM, DMARC: the guest list, the seal, and the bouncer
SPF is the guest list, DKIM is the seal, DMARC is the bouncer. The three email-authentication records explained without jargon.
The mailbox giants changed the rules: authenticate, or get filtered and rejected
In February 2024, Google and Yahoo began requiring sender authentication from volume senders; Microsoft now applies the same (2025). What changed, who it affects, and how to check if your domain passes.