After Trend Micro receives the necessary information, the IP addresses are monitored and Trend Micro communicates with the IP block owners to determine validity of the claims.
Trend Micro determines what actions caused the listing, what has been done to resolve these issues and what can be done to prevent issues from occurring again. If necessary, Trend Micro may contact you about abuse handling policies, acceptable use policies, and any problems encountered in the notification.
Trend Micro documents and studies these discussions in order to proceed with a recommendation for the listing (removal, probation, maintain listing). There is a probationary period where the IP is removed from the list but can be reactivated without a new nomination if there are new occurrences. The listing is monitored for an appropriate period of time to ensure that there are no new instances of spamming activity. If there is no new spamming activity at the end of the probationary period, Trend Micro removes the IP address from the blocked lists.