Email Authentication Knowledge Base
Practical guides to help you understand and implement SPF, DKIM, and DMARC. Protect your domain from email spoofing and improve deliverability.
Email Authentication Basics
What is DMARC and Why Should You Care?
A plain-English guide to DMARC — how it protects against email spoofing, the three policies, and how to set it up step by step.
What is DKIM and How Does It Work?
How DKIM signs your outgoing mail with a private key, what receivers do with the public key in DNS, selector rotation, key sizes, and the link to DMARC alignment.
Email Authentication: SPF, DKIM, and DMARC Explained
How SPF, DKIM, and DMARC work together to protect your domain. Why you need all three and how the authentication flow works.
How to Move from p=none to p=reject: A Step-by-Step DMARC Migration Guide
A safe, phased migration plan — monitor, ramp quarantine, ramp reject, tighten alignment — with explicit checkpoints, rollback rules, and report triage tips.
Gmail & Yahoo Bulk Sender Requirements (2024+): What You Need to Comply
A practical guide to the February 2024 requirements: SPF + DKIM, DMARC with alignment, one-click List-Unsubscribe, the 0.3% complaint threshold, and how to audit your domain.
Authorizing Senders Explained
When a sender appears in your inventory you can authorize, revoke, or keep watching. Explains how Sendvery picks the recommendation and what each label actually changes.
DNS & Records
SPF Record: The Complete Guide
Everything about SPF records — syntax, mechanisms, the 10 DNS lookup limit, common mistakes, and how to fix them.
MX Records Explained: How Email Routing Works
How email routing works under the hood: priorities, multi-MX failover, common provider records, and the subtle interaction between MX, SPF, and reverse DNS.
Ready to put this knowledge into action?
Automated DMARC report parsing, DNS monitoring, and AI-powered insights. Free for 1 domain, no credit card required.
Free plan • No credit card • 2-minute setup