Hi, I have tried everything with regards to sending more than 5,000 to our customers each day. I have tried Apex, workflow/email alerts and cannot do this. In fact, there is NO way of doing this. Simply, we have 400,000 customers and on average need to send 10,000 invoices and appointments out each day. They are not manually sent by clicking a button on the account/contact page. They are sent hourly each day. What do i need to do to send more than 10,000 emails per day to person accounts? What do large companies use?  thanks