Want a PHP scipt to send bulk emails

We need to create a php script to send emails To: email id or we can import from text file Sub: Message: Send --------------- Script must change source email id dynamic like noreply1, noreply2, 3 ,4 to 100000 (depend on how many email need to send) Script must change Subject also: if subject is: Alert important so it will add Alert important date + time +serial (001) > increase as per number of target emails So send me ur sample if you can do and i will award bid serious persons Thanks