The User Manager tab displays the current list of local users, and it allows you to add or remove local users. The list of local users entered here is used when configuring user-based rules, such as Attachment Checking rules and Content Checking rules.
NOTE: GFI MailSecurity uses the local domains list, configurable from the
Local Domains tab, to determine whether a new email address is local or not. A notification dialog box is displayed if you enter a non-local user, as shown in the screenshot below.