DKIM Checker
To check DKIM, enter the domain and selector (or try common selectors such as google, selector1, k1 and default): ClickZM reads selector._domainkey.domain, parses the tags, checks the key type and estimates the key size.
- Free
- No signup
- Live DNS over HTTPS
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How to use DKIM Checker
- 1Enter the website address, domain or IP you want to check.
- 2Click the button to run the DKIM Checker.
- 3Read the results; warnings and errors are highlighted with an explanation.
- 4Fix any issue, then run the check again to confirm.
DKIM Checker: questions people ask
Where do I find my DKIM selector?
In an email's DKIM-Signature header (the s= value), or your email provider's DKIM settings.
What key size should I use?
2048-bit RSA. 1024-bit keys are considered weak.
Which DNS servers does the DKIM Checker use?
Your browser queries public DNS-over-HTTPS resolvers (Google Public DNS and Cloudflare 1.1.1.1, plus others for propagation checks) directly, so answers reflect what the internet sees, not your local cache.
Is the DKIM Checker free?
Yes. The DKIM Checker is free with no signup, no watermark and no daily limit.