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All users
Authenticated Users Only
This will only accept email from those who have exchange mailboxes,or Contacts that have been created within the Exchange Administration area in SiteControl. All other mailboxes will be blocked For example, if you didn't want to receive email from anyone outside the company for a particular mailbox, you can enable this feature.
If you select the location option, the visitor will see the address to which he/she has been forwarded to.
If you select the frame option, the visitor will only see the original domain in their address bar