Learn how Spam Complaint Bucketing for email sends works in the Reports tool.
Your spam complaint rate is calculated by dividing the number of complaints received per day by the number of subscribers who received your message. The spam complaint bucketing process provides a more accurate view of spam complaint rates; particularly when displaying data breakdown by day.
Suppose that you send an email to 10 subscribers on Tuesday. You receive no complaints about that email on Tuesday. However, you get one complaint on Wednesday and one on Thursday. If you look in the tracking section of the application, you see one complaint recorded for Wednesday and one for Thursday. However, when you run this report, you see that the two complaints are attributed to the send on Tuesday. This works out to a 20 percent complaint rate because all complaints are bucketed with the sends.
If the send and complaints fell into different buckets your complaint rate would be negatively impacted. In the prior example, if you send to 10 subscribers on Tuesday and receive no complaints that day, your complaint rate for Tuesday is zero. However, with one complaint received on Wednesday and one on Thursday, your complaint rate for those days would be greater than 100%.