One thing this article doesn't mention is monitoring your CAA record too. Unless your DNS is hosted and administrated by yourself, which is unlikely if you are

One thing this article doesn't mention is monitoring your CAA record too. Unless your DNS is hosted and administrated by yourself, which is unlikely if you are using a hosting service for your jabber service, a targeted attack coordinated by a state/police could also affect your DNS zone records. Another thing this article doesn't mention is given the nature of the protocol, any user should make sure he communicates to recipients using servers who have set a decent level of security standards. That is the hardest part to do.