What does the bounce score mean? Why is it sometimes zero?
Subscribers appear in the Bouncing Subscribers table when a list message to them is rejected by their mail server. But the Bounce Score displayed in the table is not just the number of bounces; it’s calculated from a formula that depends on the number of bounces, the severity of the bounces, and the frequency of bounces compared to the frequency of traffic on the list. Also, bounces are purged from the system when they’re 30 days old, so that data is only accumulated over the last 30 days. If a subscriber has a temporary (low-severity) bounce once every month or two on a list that gets a lot of traffic, their bounce score may show up as zero. If the most recent bounce date shown for a subscriber in the table is older than the most recent traffic on the list, then it must have been a temporary bounce and they must have successfully received later messages.
