I know the email address. The fact is that, I can't mail them directly from outlook or other email address of mine, because I am not member of dream host. My BOSS is the member & he is just paying. I am checking the IT system & trouble shooting. For that purpose I can log In using his ID.
So, when I reply from outlook, the mail bounced as I am not in their member list.
In that case I need to reply 1 problem of mine but can't send mail from "Support" link. From there I just can read their answer.