By becoming a member of Return Path's Certification Program, pch.com would receive inbox placement benefits at 3.5 billion inboxes, including providers like Microsoft, AOL, Yahoo, Gmail, Comcast, and more. They would also receive special privileges that would give them the bump in response that they desired. These privileges include the advantage of no hourly throttling limits. Since pch.com sends a large volume of emails every day, the ability to send email without volume limitations gave them the added flexibility to send messages that arrive at the right time.