Free tool
DKIM checker
Find a domain's DKIM public key. We try the common selectors for you, or check the one you enter. Free, no sign-up.
Enter a domain. We try 28 common selectors, or add your own selector to check just that one.
What it checks
What this tool checks
Three things, every time you run it.
- 01
Tries common selectors
google, default, selector1, selector2, k1, s1, mail and 21 others. Or enter your own.
- 02
Reads the key
Shows the key type (RSA or Ed25519) and checks that it is published correctly.
- 03
Checks key length
Flags keys shorter than 1024 bits and keys that have been revoked.
Results
How to read the result
Every result comes with a plain reason.
A valid DKIM key is published for this selector.
The key works but is shorter than recommended, or it has been revoked.
None of the selectors we tried has a key.
Checking more than a few?
Upload a CSV and verify every address with all six checks. Start with 200 free credits.
FAQ
DKIM checker questions
Short answers about this tool.
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Check your list before you send it
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