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Thanks to: https://community.spiceworks.com Solution: In Exchange Server 2010, you may also experience this issue if the Exchange Servers group does not have the appropriate permission to the mailbox object in Active Directory. The most common cause for this is broken Access Control List (ACL) inheritance in Active Directory. To check whether inheritance is disabled on the user: Open  Active Directory Users and Computers . On the menu at the top of the console, click  View  >  Advanced Features . Locate and right-click the mailbox account in the console, and then click  Properties . Click the  Security  tab. Click  Advanced . Make sure that the check box for "Include inheritable permissions from this object's parent" is selected. If the user is a member of certain protected groups such as Domain Administrators, it is normal for this box to be unchecked. If you are experiencing a problem with members of these protected groups you should check the permi

Thank to: https://exchangepedia.com/ In Exchange Server 2003, mail for a recipient can be forwarded to an alternate recipient by modifying the recipient’s  Delivery Options  in  ADUC  | recipient -> properties |  Exchange General  tab. Figure 1:  Use  Delivery Options  to auto forward email to an alternate recipient in Exchange 2003 If you need to forward mail to an external email address, you can’t simply type the address in the  Forward to:  field on the  Delivery Options  page. A  (mail-enabled)   Contact  needs to be created in  AD  first, and Delivery Options modified to point to the Contact. Forwarding mail to an external address in Exchange 2010 and Exchange 2007 In Exchange 2010/2007, these tasks remain the same. However, instead of using  ADUC  to accomplish them, you use the  EMC  or the Shell (aka “ EMS “).  The new term for a Contact is  MailContact . Create a MailContact Create a MailContact using the  EMC : Expand  Recipeint Configuration  |  Mail Cont