DKIM tool

DKIM checker

Enter a domain and the selector your email provider uses. You get a reading like the example: the published key, its strength, and whether it has been revoked.

Example resultDKIM key · selector2._domainkey.microsoft.com

1024bit key

Key published, under 2048 bits

RSA key clears the 1024-bit floor but sits under the 2048-bit recommendation — ask your platform whether a longer key is available.

01024 weak2048

Published record · selector2._domainkey.microsoft.com

Published DKIM record

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCPkb8bu8RGWeJGk3hJrouZXIdZ+HTp/azRp8IUOHp5wKvPUAi/54PwuLscUjRk4Rh3hjIkMpKRfJJXPxWbrT7eMLric7f/S0h+qF4aqIiQqHFCDAYfMnN6V3Wbke2U5EGm0H/cAUYkaf2AtuHJ/rdY/EXaldAm00PgT9QQMez66QIDAQAB;

Example result

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 health, blacklists and domain & SSL expiry in one free scan — with the exact record to paste in to fix each problem.