How to configure Mail Server and Virus Protection Settings in Plesk
• Go to server management : Settings tab.
• Three links in mail category, mail server settings and virus protection settings will direct you to the same page.
• Go to Mail Server settings icon. The page shows four tabs: Settings, Black list, white list and Mail Queue. Settings: To make or alter settings of mail; Black list: Block mail from certain domains; White list: Allow email from certain IP ranges; Mail Queue: Shows current mails in queue.
• Be careful when setting this option too high as it can result in customers being forced to choose tough passwords. Configure the settings and click on Ok button, when done.