Email authentication guides
Practical, no-nonsense guides to SPF, DKIM and DMARC. Fix what is broken and keep your mail out of spam.
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.
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.
How to Add SPF, DKIM, and DMARC Records in AWS Route 53
A precise walkthrough for adding SPF, DKIM, and DMARC records in AWS Route 53 using the Create Record flow. Covers correct TXT quoting, leaving the record name blank for the root SPF record, the _dmarc subdomain, how Amazon SES auto-publishes DKIM CNAMEs into your hosted zone, and starting DMARC at p=none before tightening. Verify the result with the SPFWise checker.
Postmark SPF, DKIM & DMARC Setup: The Complete Domain Authentication Guide
Postmark already makes SPF pass through its own Return-Path on mtasv.net, so the authentication work that actually matters for DMARC is the DKIM TXT record and a custom Return-Path CNAME to pm.mtasv.net. This guide explains why an SPF pass is not the same as SPF alignment, walks through both records in your DNS, sets a sensible DMARC policy, and shows how to confirm the finished result.
Brevo SPF, DKIM & DMARC Setup: Authenticate Your Domain (formerly Sendinblue)
Brevo authenticates your domain with DKIM, not SPF. On shared IPs the envelope sender stays on Brevo's domain, so SPF does not align to your From address, but Brevo signs mail with your domain and DMARC passes on DKIM alignment alone. This guide covers the brevo_code record, automatic and manual DKIM flows, the Sendinblue rename, the Gmail and Yahoo rules, and how to verify.
550 5.7.1 'Email Rejected Per DMARC Policy': Causes and Step-by-Step Fix
A 550 5.7.1 email rejected per DMARC policy bounce means the receiving server enforced your p=reject or p=quarantine policy because the message failed DMARC. This guide shows how to tell whether it is your own mail or a forgotten third-party tool, how to read the bounce, and how to add the missing SPF include or DKIM key instead of weakening your policy.
550-5.7.26 'Unauthenticated Sender' in Gmail: What It Means and How to Fix It
Gmail returns 550-5.7.26 when a message has no passing, aligned authentication. This guide decodes the exact wording and maps it to three fixable causes: neither SPF nor DKIM passing, an SPF or DKIM pass that does not align with your From domain, and a missing DMARC record. Includes a copy-paste diagnostic checklist and a free domain check that shows which of the three is failing.
DMARC for Parked and Non-Sending Domains: The Day-One p=reject Setup
A domain that never sends email is a favorite target for spoofing. This guide gives you the copy-paste lockdown record set for a parked or non-sending domain: v=spf1 -all, an empty DKIM key, a null MX, and a straight-to-p=reject DMARC record with no monitoring rollout. You will also get a CNAME pattern to manage dozens of parked domains from one central record, plus how to confirm the lockdown with a free checker.
Google Workspace SPF, DKIM & DMARC Setup: A Complete Step-by-Step Guide
A precise, ordered walkthrough for authenticating a Google Workspace domain. Copy the exact SPF value, run the Admin Console DKIM "Start Authentication" flow with the 2048-bit key set correctly, then add DMARC last. Validate each record live before moving on so you never stack a second mistake on top of the first.
Amazon SES SPF, DKIM & DMARC Setup: The Complete DNS Configuration
Amazon SES passes SPF by default but does not align it for DMARC until you configure a custom MAIL FROM subdomain. This guide walks through Easy DKIM's three CNAME records, domain identity verification, the SPF TXT and MX records that fix DMARC alignment, and how to verify the whole stream in the checker before you enforce a reject policy.
SendGrid Domain Authentication: SPF, DKIM & DMARC Setup (Automated vs Manual Security)
SendGrid Domain Authentication publishes CNAME records on a delegated em1234 subdomain so SPF and DKIM pass without touching your root SPF. This guide explains the delegated-subdomain model, contrasts Automated Security (CNAME) versus Manual (TXT), and shows how to add the DMARC policy SendGrid will not create for you, then confirm every CNAME resolves.
How to Set Up SPF, DKIM, and DMARC for Mailchimp (2026 Step-by-Step)
Mailchimp authentication in 2026 is simpler than most guides claim: two CNAME records for DKIM and one TXT record for DMARC, with no SPF include to edit. This guide shows the exact records to paste, how to verify them with a free checker, and how to read your first DMARC report so campaigns align and stop landing in spam.