>hello, as they are, need your help I have a client who needs to send more than 100 emails per hour because the customer is a college and should send notes to parents of students,
> but policies on the Internet when the mail server that they have contracted out realizes that more than 100 email
>hourly blocks their service and sees it as spam

I had the same issue with a customer but they only needed to send out about 500-600 emails once a week. They are using an inexpensive Cable Modem account with a static IP address. There were two alternatives:
(1) Get a more costly account from their ISP imeWarner.
(2) Put a 20 second pause between emails since this was found to work OK.
I chose the 20 second pause and the emails get issued at a leisurely pace taking around 4 hours. Not a problem with this low volume, so the customer starts the task Monday morning and walks away from it until it finishes.