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Check your domain’s SPF, DKIM and DMARC

Enter your domain. We look up its public DNS records and tell you what’s set, what’s missing and what to fix.

By Tellnod team · Updated

What it checks

  • SPF: present, a single record, and ending in ~all or -all
  • DMARC: present, and whether its policy is none, quarantine or reject
  • DKIM: keys at the selector names common senders use

Tellnod runs these checks on every campaign before the confirmation card, and adds the unsubscribe link, headers and postal address for you.

FAQ#

Do you contact my mail server?

No. The checker only reads public DNS records, the same ones any receiving mail server reads.

Why does it say DKIM wasn’t found when I have it?

DKIM keys live under a name the sender picks, and DNS can’t list them. We check the names most senders use. If yours uses another, check its setup page.

Do I need all three?

Gmail and Yahoo ask bulk senders for SPF, DKIM and DMARC. Even small shops reach the inbox more reliably with all three.

Sources#

  1. [S1] Google Workspace Admin Help: Email sender guidelines, checked