Guides d'authentification des e-mails
Des guides pratiques et sans détour sur SPF, DKIM et DMARC. Corrigez ce qui ne fonctionne pas et gardez vos e-mails hors du spam.
What Is SPF Flattening and When You Need It
SPF flattening replaces include, a, and mx mechanisms with raw IP addresses to stay under the 10-lookup limit. Learn how it works, why it breaks when provider IPs change, and safer alternatives to reach for first.
What Is the Return-Path (Envelope Sender)?
The Return-Path (envelope sender) is the hidden address SPF actually checks and where bounces are delivered. Learn how it differs from the visible From, why it controls SPF alignment for DMARC, and how a custom bounce domain fixes ESP traffic.
How to Read Email Headers to Check SPF, DKIM and DMARC
A practical walkthrough of email headers: how to open the raw source in Gmail, Outlook, and Apple Mail, then read the Received chain, Return-Path, and Authentication-Results to confirm SPF, DKIM, and DMARC or diagnose a failure.
Should You Send Email From a Subdomain?
A practical guide to sending marketing and transactional email from dedicated subdomains: why reputation isolation protects your root domain, how it interacts with DMARC alignment and the sp= tag, and how to set it up.
What Is Email Authentication? A Complete Guide
A plain-language pillar guide to email authentication: why open SMTP has no built-in identity, and how SPF, DKIM, DMARC, and supporting signals like PTR, ARC, BIMI, and MTA-STS work together to prove a message really came from your domain.
How to Find Where Your DNS Is Hosted (So You Can Add SPF, DKIM, and DMARC)
Before you can add SPF, DKIM, or DMARC, you have to find the provider that actually controls your DNS records. Your nameservers tell you exactly who that is, and it is often not the company you bought the domain from. This guide shows you how to look up your nameservers, tell your registrar apart from your DNS host, and jump straight to the right setup steps for Cloudflare, GoDaddy, Namecheap, or Route 53.
What DNS Records Does Your Domain Need to Send and Receive Email?
A complete, ordered map of the DNS records a domain needs to send and receive email: MX and its A/AAAA target to receive, SPF, DKIM and DMARC to authenticate, plus optional MTA-STS and BIMI. Learn which records are mandatory versus optional and the exact order to add them so nothing breaks mid-setup, then confirm each one with a free scan.
What Is a DNS TXT Record? A Plain-English Guide for Email Authentication
A DNS TXT record stores plain text in your domain's DNS, and for most people the only reason to touch one is email authentication: SPF, DKIM, and DMARC all live in TXT records. This guide shows annotated real examples, explains the host, value, and TTL fields, and covers the 255-character split and multiple-strings gotchas that quietly break records.
How to Set Up SPF, DKIM, and DMARC on GoDaddy Without Breaking Email
A step-by-step guide to configuring SPF, DKIM, and DMARC in the GoDaddy Domain Portfolio DNS panel. Learn how to merge multiple SPF includes into one record, avoid the @ versus host-prefix mistake, add records in the safe order so nothing bounces, and verify the result with a paste-ready DMARC starter policy.
Namecheap SPF, DKIM, and DMARC Setup Guide (Step-by-Step)
A precise walkthrough for adding SPF, DKIM, and DMARC records in Namecheap Advanced DNS. Covers when the tab is available, the @ versus blank Host confusion, correct TXT value formatting, DKIM as CNAME or TXT depending on your sending provider, and how to verify the records actually took effect.
How to Add SPF, DKIM, and DMARC Records in Cloudflare (Step-by-Step)
Add SPF, DKIM, and DMARC in Cloudflare DNS with exact dashboard clicks and paste-ready TXT values. Covers the traps that break setups: TXT records must be gray-cloud DNS only, Cloudflare auto-appends your domain so you enter _dmarc not the full hostname, and how the Email DMARC Management wizard differs from manual records. Then confirm authentication passes with the free spfwise checker.
Mailgun SPF, DKIM & DMARC Setup: Authenticate Your Sending Domain Step by Step
Mailgun authenticates through a dedicated sending subdomain, so the SPF include:mailgun.org and the mx._domainkey DKIM TXT belong on mail.yourdomain.com, not your root. This guide walks through every DNS record Mailgun asks for, how to merge SPF into an existing root record, the optional MX and CNAME tracking records, the propagation wait, adding a root-level DMARC policy, and verifying the whole chain.