Implement DANE for outgoing mail authentication.
DANE ensures that email is only deleverd over a secure path.
See: https://github.com/internetstandards/toolbox-wiki/blob/main/DANE-for-SMTP-how-to.md
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DANE ensures that email is only deleverd over a secure path.
See: https://github.com/internetstandards/toolbox-wiki/blob/main/DANE-for-SMTP-how-to.md