The Manage Domains > Message Filters page enables system administrators to configure a set of rules to be applied to messages received by specific accounts, as well as to view and change any of the similar rules created by the users themselves. The page gives access to other 2 sub-pages:

• Admin Filters - containing the parameters relative to incoming message rules and filters.
  
• User Filters - containing the parameters relative to incoming message rules and filters set by users in WebMail > Settings > Filters page.

See subsections of current page for more details:

Admin Filters
User Filters