Check for correct DKIM setup

[sesh]

I'm not sure if this is actually possible. The DKIM record is public but isn't easily guessable. Most guides for testing this suggest sending yourself and email and inspecting the raw message.

• https://www.gov.uk/government/publications/email-security-standards/domainkeys-identified-mail-dkim
• https://postmarkapp.com/guides/dkim
• https://postmarkapp.com/guides/dkim/how-to-set-up-dkim
• https://www.gov.uk/guidance/set-up-government-email-services-securely

[sesh]

Closing as unlikely to be doable. Checking this configuration requires access to email headers.