The graymail management solution in the appliance comprises of two components: an integrated graymail scanning engine and a cloud-based Unsubscribe Service. The integrated graymail scanning engine identifies graymail messages using various criteria and assigns them to different categories. The cloud-based Unsubscribe Service provides an easy mechanism for end users to unsubscribe from unwanted messages by checking the reputation of the unsubscribe links and performing the unsubscribe process on behalf of the end user.
[References: User Guide for AsyncOS 12.0 for Cisco Email Security Appliances - GD (General Deployment), Chapter: Managing Graymail, Section: Graymail Management Solution in Email Security Appliance, , Reference: https://www.cisco.com/c/en/us/td/docs/security/esa/esa12-0/user_guide/ b_ESA_Admin_Guide_12_0/b_ESA_Admin_Guide_chapter_01101.pdf (p.2), ]
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