Every mail client reworks your HTML before displaying it. What Gmail, Outlook, Apple Mail, Yahoo, Orange, SFR and La Poste do, and how to design an email that holds up everywhere.
Guides, best practices and news about email deliverability, DNS authentication and domain security.
A domain that sends no email is still spoofable. SPF -all, wildcard-revoked DKIM, DMARC p=reject, null MX: the complete configuration, and the DNS wildcard trap almost nobody explains.
DMARCbis (RFC 9989/9990/9991) replaces RFC 7489 from 2015. Learn about DNS Tree Walk, new tags, the impact for senders and receivers, and backward compatibility.
Step-by-step guide to migrate to DMARCbis (RFC 9989): audit your config, 3-phase plan to p=reject, reading RUA reports, new t= and np= tags, deployment checklist.
Delisting is not automatic or guaranteed. Here's the method: diagnose first, fix second, then write to the operator with the right arguments.
Understand the three types of email non-delivery with real SMTP examples. What to do in each case to protect your sender reputation.
The most common causes ranked by impact, from DNS authentication to audience quality. A complete diagnosis to escape the spam folder.
Check your domain's email configuration
SPF, DKIM, DMARC, BIMI, blacklists, headers... complete free audit.
Start free audit →How email open tracking works: spy pixels, link wrapping, click tracking. Best practices for ethical tracking and better deliverability.
How to detect SaaS tools sending emails from your domain without authorization: DMARC reports, unknown source identification, resolution workflow, and continuous monitoring.
Complete guide to email-related DNS records: MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, PTR. Each record explained with concrete examples.