When I press reply to only the sender, it comes up but at the top is shows no subject. But there is a subject on the line, it is the subject that was on the that line on the original email. The send button is not available to let me send the reply. I have to close the entire program, then hold the alt button down and open thunderbird then hit forward on the email that I want to reply to then add the email address of the person I want to reply to before it will let me send.