Solved DKIM: Emails are signed without public key being published

[Kirby]

Steps to reproduce

1. Setup DKIM in Xenforo but do not add the DNS record
2. Send an email via XenForo
3. Check if the email is signed

Expected Result
The email is not signed

Actual Result
The email is signed

This seems rather bad as it could increase the likeliness of emails being flagged as spam.
XenForo should only enable signing after verification is successful.

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