I think so much of it is the T being clear and consistent in their email/text rules and boundaries. For example, will they allow an unlimited amount? If so, is it truly "unlimited"? Or will the client hit some invisible limit, where the T gets upset/annoyed (this happened to me with ex-T). And then possibly limits them or cuts them off entirely?

If it's too much, will they let you know early on, before it becomes a big problem for them and they potentially blow up at you? My T has always said he'd do this. (With ex-T, it was only after I asked her at one point, and it was clear she was already frustrated about them, like, "They just got longer and longer. I only have so much time. I have to give all my clients equal time" etc.)

Will the T always reply? Or only if requested? Or only if urgent? Or just to confirm receipt? What's the time frame--that day? Within 24 hours? Longer? Only during work hours/next business day (so if emailing a Friday night, maybe not till Monday morning)?

Will they ever charge for emails?

Can clients email over holidays or vacations?

Just some things to consider and potentially ask when talking to a T about their policy.