"1. He has to prove what you said is false."
If it is private person and private concern, it is defendant's burden to
prove false and faulty, not the plantiff.
"2. He also needs to prove that you are being negligent."
if you write to someone intentionally, it is more than negligent; again, if
involving private person and private concern, plaintiff has no burden to
prove negligence (faulty).
"3. Your communication with his collegues might be privileged if you and he
are working for the same compa