I would define my T's boundaries as "flexible". I crossed an email boundary last year and didn't realize it (I over-medicated a bit and emailed a long incoherent email without knowing). She was good about it; she just said that she didn't do counseling by email, but that it was okay and she would talk to me next session. Then about 2 months later, I sent a scathing, angry email. T confronted me the next session, calling the email "manipulative and borderline". She threatened referral. In hindsight, I think that was an overreaction to the email and that she took it personally. She took away email privileges for a month, then reinstated them. I crossed the boundary one more time by obsessing about something, sending 4 emails in 3 days asking for a response (on the weekend), but she handled it a bit better. She actually did respond to the email, but restated that she did not counsel via email.