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Re:Slack Is Buying HipChat from Atlassian by mapgrep on Thursday July 26, 2018 @05:19PM (#17621259)
Would Keybase Teams fit the bill, with end to end encryption? Or has to be on-prem, even if encrypted, for your requirements?

(I don't have any association with Keybase, I've just investigated this product as a Slack alternative.)

Re:Slack Is Buying HipChat from Atlassian by floren on Thursday July 26, 2018 @05:31PM (#17621409)
We use Keybase for work chat. It's quite good, and the file sharing options make it even better--you get a synthetic filesystem mounted under /keybase, so you can share a file to the whole team by copying it to /keybase/team/TeamName/, or share it with just one person by copying to /keybase/private/<you>,<them>/
Re:Slack Is Buying HipChat from Atlassian by solatic on Thursday July 26, 2018 @05:31PM (#17621394)
Has to be on-prem if the networks are air-gapped. KB Teams also has a long way to go to meet feature-parity - channels, integrations, etc.