SPF & DMARC Checker

How to use this SPF & DMARC checker

  1. Enter a domain name.
  2. Optionally add a DKIM selector if you know it (check your email provider's setup docs).
  3. See each record's presence and raw value instantly.

Why do I need a DKIM selector?

Unlike SPF and DMARC, which always live at a fixed, predictable location, DKIM records are published under a selector name chosen by whoever configured your email (like "google" or "s1") — without knowing that selector, there's no fixed place to look, so it can't be auto-discovered.

What happens if SPF or DMARC is missing?

Without SPF, receiving servers have no way to verify that mail claiming to be from your domain actually came from an authorized server — this makes it easier for spammers to spoof your domain, and your legitimate mail is more likely to land in spam.

Where do I find my DKIM selector?

Check your email provider's DNS setup instructions (Google Workspace, Microsoft 365, etc. all document their default selector), or look at the DKIM-Signature header of an email you've sent — it includes an "s=" field with the selector.