https://www.cisco.com/c/en/us/td/docs/security/ces/ces_14-3/user_guide/b_ESA_Admin_Guide_ces_14-3/b_ESA_Admin_Guide_12_1_chapter_01110.html
User Guide for AsyncOS 14.3 for Cisco Secure Email Cloud Gateway - Managing Spam and Graymail...
Managing Spam and Graymail