@IniBudi: Thank you for your comment. The DNS entries for MTA-STS are not the problem; I can easily store them with a domain and DNS provider. The critical point is storing the necessary TXT file with the actual rules of conduct, which cannot be provided at the DNS level. To do this, I need a web server under the respective domain, and so, when using Cloudron, I automatically end up in the Cloudron user interface and in the domain settings area. There is already an area for so-called “well-known URIs” where entries for services such as Matrix, Mastodon, and Jitsi can already be stored. In my opinion, to implement this cleanly in cloudron, all that is needed is an input field where the MTA-STS rules can be stored.
