DKIM
CHECKER
Enter a domain to find its DKIM records. Because DKIM keys live under a selector name that each provider chooses, we probe the selectors used by Google, Microsoft, Zoho, Proton, SendGrid, Mailchimp and other common senders, and report every published key we find. Add a specific selector if you know it.
What is a DKIM Checker?
A DKIM checker is a free tool that finds a domain’s published DKIM keys, the cryptographic signatures that prove an email came from the domain and was not altered. Because DKIM keys live under a provider-chosen selector, it probes the common selectors used by Google, Microsoft, Zoho and others, or takes a selector you supply.
How does a DKIM Checker work?
- 01We probe the domain against a list of widely-used DKIM selectors.
- 02Any selector that returns a v=DKIM1 public key is reported as found.
- 03No result on common selectors means DKIM is absent or uses a custom name.
Frequently asked questions
What is a DKIM selector and why do I need it?
DKIM keys are published at selector._domainkey.yourdomain, where the selector is a label the sending service picks (google, s1, k1 and so on). There is no way to list every selector for a domain from DNS alone, so a checker either needs the selector or probes the common ones. If you know yours, from your email provider’s setup page, enter it for an exact result.
This tool found no DKIM record. Is my email unsigned?
Not necessarily. It means none of the common selectors resolved, but your provider may use a custom selector this tool did not try. Check your email or hosting provider’s DNS setup for the exact selector, then re-run with it. If there genuinely is no DKIM, your mail is more likely to be marked as spam or spoofed.
How does DKIM relate to SPF and DMARC?
DKIM adds a cryptographic signature that proves a message was not altered and came from the domain. SPF authorises sending servers, DKIM signs the content, and DMARC ties both to the visible From address and sets the enforcement policy. Modern deliverability needs all three aligned, which is exactly what a well-run email host configures for you.