What is changing on the Spam setup page found in Webmail?
Webmail’s “Spam Filtering” configuration page indicates that Spam filtering is optional and supports user thresholds, it also has a section to list Banned and Allowed addresses. Some of these settings only affect users of the previous system and were developed for use with SpamAssassin (previous system). Neither opt-in spam filtering or user based thresholds will be supported in the new system, so neither of these settings will have an effect once you have been migrated onto the new mail protection system. Users who have not been migrated onto the new mail protection system will continue to have the option of filtering email, until they are migrated. This FAQ has the most current list of all domains which have been migrated onto the new system, this is located here. The Banned and Allowed addresses list however, will continue to be active with both systems. Once all users have been migrated onto the new system, the Webmail control page will be updated to allow only approriate changes.