I can't have any interruptions in my email service. What happens if my payment fails or I forget to provide payment information before my free trial ends?
If your account reaches 30 days past due then services will be suspended. However, services are suspended in such a way that mail is deferred instead of being bounced/rejected. Paying the past due balance on an account that is suspended will instantly reactivate all services. Also, most mail servers are setup so that they will automatically re-try sending deferred mail for five days. In most cases there is minimal (if any) loss of mail for accounts that are suspended and then re-activated within a few days.
Here's a chart that shows how our billing system handles past due accounts: