The externally facing communications systems used by newsrooms and freelancers get the bulk of the attention, justifiably.
The internal systems teams use to communicate are often defaulted to, and at best they've got a data retention policy that eases the concerns regarding subpoenas and ignores surreptitious interception. I'm always up to rant about hygiene being ten times more important than a quick deletion policy, but I think we'll save that for a day when folks can see the fear in my eyes for themselves.