SPF, DKIM, DMARC — by provider.
Step-by-step setup with the exact records, the order to publish them, and the verification check. Pick your sending provider — the rest writes itself.
- Issue 01 · workspace.google.comSPF · DKIM · DMARC
Google Workspace
Google Workspace (formerly G Suite) handles mail for many small and mid-size businesses. The DNS setup is well-documented but the DKIM step requires generating the key inside the Admin console first.
- Issue 02 · microsoft.comSPF · DKIM · DMARC
Microsoft 365
Microsoft 365 (Exchange Online) is the other major business mail platform. DKIM in Microsoft 365 uses two CNAMEs that point at Microsoft-hosted keys — different from Google's single-record approach.
- Issue 03 · sendgrid.comSPF · DKIM · DMARC
SendGrid
SendGrid (Twilio) is one of the most-used transactional ESPs. Their domain authentication wizard generates per-account CNAMEs you publish on a sending subdomain — never on your apex.
- Issue 04 · mailgun.comSPF · DKIM · DMARC
Mailgun
Mailgun's authentication is API-driven and slightly more developer-oriented than SendGrid's. They issue both SPF and DKIM records when you add a domain.
- Issue 05 · aws.amazon.comSPF · DKIM · DMARC
Amazon SES
Amazon SES (Simple Email Service) is the cheapest at-scale transactional ESP. Setup is more steps than the polished SaaS ESPs but the records are stable and well-documented.
- Issue 06 · postmarkapp.comSPF · DKIM · DMARC
Postmark
Postmark is a transactional-only ESP with strict acceptable-use enforcement. Their authentication setup is the simplest of the major ESPs.
- Issue 07 · mailchimp.comSPF · DKIM · DMARC
Mailchimp
Mailchimp (Intuit) is primarily a marketing ESP. Domain authentication is required as of 2024 to send to Gmail and Yahoo at any volume.
- Issue 08 · brevo.comSPF · DKIM · DMARC
Brevo
Brevo (formerly Sendinblue, rebranded 2023) is a marketing + transactional ESP popular outside North America. Their setup uses delegated subdomains similar to SendGrid.
- Issue 09 · zoho.comSPF · DKIM · DMARC
Zoho Mail
Zoho Mail is a budget-friendly business mail platform. The DKIM step is unusual — you generate the selector inside the Zoho admin console rather than using a fixed name.
- Issue 10 · fastmail.comSPF · DKIM · DMARC
Fastmail
Fastmail is a privacy-oriented business mail provider. Their DKIM CNAMEs are the cleanest of any major ESP — three records, fixed names, point at hosted keys.
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