The Kalenfy blog
Security, in plain English
Guides on SPF · DMARC · DNSSEC & more — then scan your site free
Fixes & troubleshooting
27 June 2026
How to Fix SPF “Too Many DNS Lookups” (PermError)
SPF "too many DNS lookups" (PermError) silently breaks your email authentication. Here's how to check your lookup count and fix it — flattening, removing includes, and more.
Email authentication
27 June 2026
Email Spoofing: How Attackers Fake Your Domain (and How to Stop It)
How email spoofing works, why it's so easy without protection, and the three records — SPF, DKIM and DMARC — that stop attackers from sending phishing emails as your domain.
DNS & domain security
27 June 2026
What Is DNSSEC and Why Your Domain Needs It
DNSSEC explained simply: what it is, the DNS spoofing and cache-poisoning attacks it prevents, how to check if DNSSEC is enabled, and how to turn it on for your domain.
Email authentication
27 June 2026
SPF Records Explained: How to Check and Fix Yours
What an SPF record is, how the v=spf1 syntax works, the 10-lookup limit, the most common SPF mistakes (+all, multiple records, softfail) and how to check your SPF for free.
Email authentication
27 June 2026
What Is DMARC and How to Set It Up (Plain-English Guide)
DMARC explained in plain English: what a DMARC record is, how p=none, quarantine and reject work, how to check your DMARC record, and the common mistakes to avoid.
Guides & checklists
27 June 2026
How to Check if Your Website Is Secure (Free 2026 Checklist)
A practical, free checklist to check if your website is secure in 2026 — HTTPS, SPF, DKIM, DMARC, DNSSEC, security headers and exposed files, with how to test each.