DNS Doctor
DKIM tool

DKIM checker

DKIM keys are published at unpredictable selector names — a free scanner can only guess a handful of common ones. If you know the exact selector your email provider uses (check its docs, or the DKIM-Signature header on a sent message), check it directly here. We show the raw record, key strength, and whether it's revoked.

Diagnose your domain

Check SPF, DMARC, DKIM, MX, DNS and expiry in one free scan — with the exact record to paste in to fix each problem.