What are Earth Class Mail's Terms of Service and Acceptable Use Policy? ECM Developer January 30, 2020 17:13 Updated Follow By using Earth Class Mail Services, you are agreeing to our Terms of Service and Acceptable Use Policy. Please read them carefully. Related articles Cancellation FAQ's Recording a Payment to QuickBooks Send to Bill.com What is a USPS 1583 form, and do I need to complete one? How do I change my billing address?