Your email administrator may or may not have set up a Friends (whitelist) or Enemies (blacklist) list for all users. You can view this list, but cannot make any changes to it. If you feel that something is whitelisted or blacklisted by mistake, contact your email administrator.
To view an administrative Friends list (whitelist)
To view an administrative Enemies list (blacklist)
The following screenshot highlights the Friends and Enemies links in the Filter by Sender section: