Email Anti-Spoofing Guide
A plain-language guide to protecting your domain from spoofed emails using SPF, DKIM, and DMARC. Check your configuration instantly — no sign-up required.
What is SPF? How Email Sender Authentication Works
The foundation of email anti-spoofing: how SPF works, how to write a record, and the pitfalls — including the 10-lookup limit — that can silently break delivery.
What is DMARC? A Beginner's Guide to Email Anti-Spoofing
How SPF, DKIM, and DMARC work together, what the policy levels (p=none / quarantine / reject) mean, and why it matters now.
Gmail, Yahoo & Microsoft Email Sender Requirements
What the major inbox providers require from senders — and what happens to your mail if you don't comply.
Moving DMARC from p=none to p=reject Safely
Step-by-step guide to reaching a reject policy without disrupting legitimate mail delivery.
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