A system administrator cannot do their job without (inadvertently) gaining access to everything. You can obfuscate it a lot, and make it a bit more difficult in many ways, but ultimately, someone with system admin rights will always be able to get to your data.
You have to trust your administrators with the information you have in the systems they run.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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