There will be an update to the software on the spam filtering systems on Monday, 11/30/19 at 2:00 am EST (11:00 pm PST). This update will provide a more comprehensive spam filtering process and enhanced functionality of associated components, such as whitelisting and blacklisting. The spam filtering system is fully redundant and each system will be updated individually. There is no expected interruption of either inbound or outbound mail flow during this update. If you have any questions or issues regarding the update, please contact support.