>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

Using another SMTP to offload the rest would probably be a no go as SMTP server providers usually only allow their own customers to use it. You can put a time delay so to make sure to not reach the 100 emails per hour but that may create a backlog of emails which will get delayed.