DKIM Checker

Look up a specific selector and inspect the published key.

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Result for smtpapi._domainkey.github.com

k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDPtW5iwpXVPiH5FzJ7Nrl8USzuY9zqqzjE0D1r04xDN6qwziDnmgcFNNfMewVKN2D1O+2J9N14hRprzByFwfQW76yojh54Xu3uSbQ3JP0A7k8o8GutRF8zbFUA8n0ZH2y0cIEjMliXY4W4LwPA7m4q0ObmvSjhd63O9d8z1XkUBwIDAQAB
Key type
rsa
Key length
1024 bits
Revoked
no
Test mode
no

Issues

  • Warning DKIM key is 1024 bits.
    Modern guidance is 2048+. Most providers can rotate to 2048-bit keys without breaking anything.