TRIGGER WARNING: VIOLENCE

I'm guessing Ts and ex-Ts always read whatever you send them, even if they don't reply. And that would be especially true of emails.

The reason being, buried in your letter might be an explicit threat of violence towards yourself, towards T or towards someone else. If you were to follow through on that, the police would check your outgoing emails as a matter of course. That would put your T in some pretty hot water. At the very least, they'd have to go on the witness stand and explain why they ignored such obvious warning signs. There would be a media circus and hate mail, to say nothing of the guilt they would feel.

Just my guess.