MailEnable Enterprise Guide
Mailbox - Spam
Administration > Mailbox configuration > Mailbox - Spam

Various global spam options can be enabled/disabled under mailbox spam properties

Settings Description
Enable greylisting When enabled enables greylisting for the mailbox. If greyed out please refer to Postoffice - Feature selection
Deliver to Junk E-mail report When enabled will allow the report agent to deliver a Junk E-mail report for the contents of the users Junk E-mail. Please refer to the Report - Agent for more information