In session I believe this is true. Outside of session, I don't think this applies to emails that a poster never discussed with the T, but just starts sending them and the T responds. I think if you expect something from a T, especially something ongoing and outside of session and for free, you should discuss rather than just assuming because they replied once that they will continue to do so. This is pretty basic in communication and part of the contract of being a client-- you bring up the things you want, the T responds. It's not his job to bring up the emails or explain his limits pre emptively. Just because someone is a T, it doesn't mean that rules of general communication don't apply. If you want something from someone, you need to ask. Otherwise it's just entitlement, expecting something for free from a person who works for living, works for you in fact.