We've noticed that reports of spam are counted at the time of the report, not the time the email was sent. So if a recipient received multiple emails over the course of a month and then decided later to mark them all as spam, we see an immediate spike in the spam counts. This means that a single recipient could cause our account to be throttled. We'd like to see the time the original email was sent factored into the spam reporting so that our account is not limited based on an action that we have no way of fixing.