I personally use #XMPP+#OMEMO for 1:1 chats and have deployed and maintained several #Zulip / https://zulip.com instances as a #corporate & #organizational chat, as it's more user-friendly than #IRC yet also allows for the necessary granularity and auditability.
@rosano@monocles I mean @delta / #DeltaChat has the big advantage that it's not "yet another server to maintain" and just setting up an extra inbox like @chat.domain.example is relatively trivial whilst also providing the desired auditability if one were to export the private keys to their archival solution.
But that's #NotLegalAdvice but just bits based off my experience as #Sysadmin in #Germany where corporate comms need to be auditable.
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