DKIM test.
DKIM is the cryptographic signature of an e-mail. Enter a domain and I scan the common selectors of Google, Microsoft, hosts and gateways. Know your selector? Enter selector:domain.
What to fix, in this order
Nothing to fix in this check.
Before you ask.
Where do I find my DKIM selector?
In the panel of the provider your mail goes through: Google Workspace (Authenticate email), Microsoft 365 (selector1, selector2), the SMTP plugin or the hosting panel. The selector also sits in the "DKIM-Signature" header of every sent message as s=.
A 1024-bit key works, why 2048?
It works, but 1024 bits are considered weak today and some providers are starting to reject them. Pick 2048 at the next key rotation.
What does the t=y flag mean?
Test mode: receivers verify the signature but do not penalise a failure. Remove it after rollout, otherwise DMARC cannot rely on DKIM.
Would you rather have meset it up and watch it?
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