Quote Originally Posted by BabaYaga
Tx guys - but what would you say if you only want to be polite, and you're saying "I hope you're feeling better by the time you read this letter" (and the letter has nothing whatsoever to do with it - it was the doctor who did it! ) ?

As I already said:
(Я) надеюсь, ты уже чувствуешь себя лучше, когда читаешь это письмо.