Email authentication guides
Practical, no-nonsense guides to SPF, DKIM and DMARC. Fix what is broken and keep your mail out of spam.
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 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.
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.
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.
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.
HubSpot Email Authentication: Connecting Your Domain with SPF, DKIM & DMARC
HubSpot sends your email from its own servers, so your DNS has to authorise it. This guide walks the connect-sending-domain flow record by record: the two DKIM CNAMEs, the return-path that makes SPF align on your own domain, why you usually leave your root SPF alone, and the DMARC policy that clears the Google and Yahoo bulk rules. Confirm every record resolves before you click Verify in HubSpot.
Klaviyo SPF and DKIM Setup: Authenticate Your Sending Domain Correctly
Klaviyo does not want you to add its servers to your root SPF record. You point a branded sending subdomain at Klaviyo with CNAME records, and Klaviyo hosts SPF and DKIM for you. This guide gives the exact records for a Klaviyo branded sending domain, explains why a raw SPF include is a mistake, and shows how to add and validate the one record Klaviyo will not create for you: your DMARC policy.
Zoho Mail SPF, DKIM & DMARC Setup: Complete DNS Configuration
Zoho Mail needs three DNS records to pass authentication: one SPF record with include:zohomail.com, a DKIM TXT record enabled per domain in the admin console with Zoho's selector, and a DMARC policy you move from none to reject over a few weeks. This guide gives the exact records, the single-SPF-record rule, the correct DKIM selector, and a staged rollout you verify live.