All free tools

Check your DKIM signing key.

Look up the public key your email provider publishes and check whether its settings need attention.

Free. No account required.

Don’t know the selector? Find it from an email. We’ll extract the signing domain and selector for you.

Checks public DNS using Google Public DNS. Google receives the queried names and your IP address. Nothing is changed. How your data is handled.

Find your selector

Find the right selector

A domain can have several signing keys. Use the selector from your email provider’s setup instructions, or paste an email’s headers to find the selector used for that message.

This checks the published key. It does not verify a message’s signature or prove that your provider is signing outgoing mail.