please reply as soon as possible when you read this email.
reply 不及物动词,不可直接接名词,后接to。而且不能说you are seeing.说不通,既不是现在进行时,也不是将来时
去掉 are 然后seeing变成see
I am looking forward to your reply.
Reply as soon as possible.
不对。
When you see this email, please reply immediately.