Free DKIM Checker

Check a DKIM record by domain and selector. We verify the v=DKIM1 tag, public key, key type and test-mode flag — then explain any problem in plain English.

google selector1 selector2 k1 s1 mail dkim

Not sure of your selector? Look at the d= and s= values in the DKIM-Signature: header of an email you sent — s= is the selector.

Watch deliverability across every domain — automatically

Get a plain-English deliverability report for all your domains, weekly. One flat price, unlimited domains.