DKIM Validator
Look up a domain's DKIM key for a given selector, check it is published and not revoked, and gauge the key strength. Resolved on Uptimeify's EU servers.
What watches these brands watches your clients too
This check works inside your AI agent, too.
You are running by hand what Claude, Cursor or ChatGPT could do for you directly. Uptimeify offers this and 19 more checks as an MCP server: SSL, DNS, email authentication and more, right in your workflow. No account, no API key, on EU infrastructure.
Frequently asked questions about DKIM Validator
DKIM publishes a public key in DNS, and the selector is the label that picks which key, the record lives at selector._domainkey.yourdomain. The selector is chosen by whoever set up signing, so you find it in the DKIM-Signature header of a real email from the domain (the s= tag), or in your email provider's settings. Common ones include google, default, k1 and selector1.
The query runs on Uptimeify's EU servers, not in your browser, the selector and domain you enter are sent to us only to perform the lookup and are not stored. As an EU-built, EU-hosted provider, Uptimeify keeps this off US infrastructure and clear of US Cloud Act exposure, which matters for agencies handling client data under GDPR.
A revoked or missing DKIM key breaks your email signatures and sinks deliverability: usually unnoticed until replies stop coming. Verify the key here, then let Uptimeify watch your domain's DNS and email records continuously and alert you the moment something changes.
Ready to Keep DKIM Under Watch?
A valid key today says nothing about tomorrow: rotated keys and deleted TXT records only surface once mail starts landing in spam. Uptimeify watches your DNS records continuously and flags the change right away.