Guides & tutorials
Practical, plain-language guides to DNS, email authentication and deliverability.
What Is DKIM and How Email Signing Works
A practical guide to DKIM: how cryptographic email signing works, how to publish the DNS record, and how to verify and fix it.
Read guideHow to Set Up DMARC Step by Step: From p=none to p=reject
A practical DMARC deployment guide: publish the record, read aggregate reports, and safely move from monitoring (p=none) to full enforcement (p=reject).
Read guideDNS Record Types Explained: A, AAAA, CNAME, MX, TXT, NS, SOA, SRV and CAA
A practical guide to the DNS record types you edit every day: what A, AAAA, CNAME, MX, TXT, NS, SOA, SRV and CAA do and how to check them.
Read guideEmail Deliverability Basics: Why Messages Land in Spam and How to Fix It
Learn why your email goes to spam and how SPF, DKIM, DMARC, PTR records, and reputation checks fix it — verify everything with dnslab tools.
Read guideHow to Remove Your IP or Domain From an Email Blacklist
A practical, step-by-step guide for mail operators to find which blacklist flagged their IP or domain, fix the root cause, and request delisting.
Read guideWhat Is SPF and How to Set It Up Correctly
A practical guide to Sender Policy Framework (SPF): how the record works, how to build one for your domain, common mistakes, and how to verify it.
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