👍 See: https://community.letsencrypt.org/t/understanding-smtp-dane-implementation-options/184274/4
For some more background info on DANE TLSA see:
- https://github.com/internetstandards/toolbox-wiki/blob/main/DANE-for-SMTP-how-to.md
- https://github.com/baknu/DANE-for-SMTP
Hope this helps.