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But if you open up their email, their limit goes up to 300 or 400 characters. But if you don't reply to their email, they stay there. On the other hand you could simply ban them and their privileged 200 characters are also gone.
But if you read and reply, the character limit goes up to 500 or more. Unless you specifically click on a button that allows them limitless space.
At one end are email concepts like on Facebook where you message me because we are connected. At the other end are regular email services where anyone can send you anything.
The inbox has to be like a cellular membrane. It has to protect the cell, but it also has to selectively allow outside stuff.
Beyond this "membrane" there have to be hard core demarcations. Facebook seems to have nailed social communication. Seems like people you know really well are only so many. And I feel like Asana is cracking the code on work communication. I have been reading up on it.