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You will need to run the below as Administrator , if the use doesn’t have local admin you will need to change them to one then remove after  ;

• Right-click on the Outlook shortcut holding the SHIFT key and choose Run as administrator
• Go to File > Options > Trust Center > Programmatic Access
• Set the programmatic access to Never warn me about suspicious activity (not recommended)

IMPORTANT NOTE: If these option are greyed out, it usually means that you didn’t run Outlook with administrative rights.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\16.0\Outlook\Security
DWORD: ObjectModelGuard
Value: 2

As an alternative way, you can achieve the same result by altering your registry file in the following way:

• Navigate through HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\15.0\Outlook\Security  (create the key if it doesn’t exist)
• Add the following DWORD item:
  • CheckAdminSettings , with a value of 1.
  • AdminSecurityMode , with a value of 3.
  • PromptSimpleMAPISend , with a value of 2.
  • PromptSimpleMAPINameResolve , with a value of 2.
  • PromptSimpleMAPIOpenMessage , with a value of 2.
  • PromptOOMCustomAction , with a value of 2.
  • PromptOOMSend , with a value of 2.
  • PromptOOMAddressBookAccess , with a value of 2.
  • PromptOOMAddressInformationAccess , with a value of 2.
  • PromptOOMMeetingTaskRequestResponse , with a value of 2.
• Navigate through HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\outlook\security  (create the key if it doesn’t exist)
• Add the following DWORD items:
  • CheckAdminSettings , with a value of 1.
  • AdminSecurityMode , with a value of 3.
  • PromptSimpleMAPISend , with a value of 2.
  • PromptSimpleMAPINameResolve , with a value of 2.
  • PromptSimpleMAPIOpenMessage , with a value of 2.
  • PromptOOMCustomAction , with a value of 2.
  • PromptOOMSend , with a value of 2.
  • PromptOOMAddressBookAccess , with a value of 2.
  • PromptOOMAddressInformationAccess , with a value of 2.
  • PromptOOMMeetingTaskRequestResponse , with a value of 2.

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There are three ways to forward mail from one user to another in Exchange

1. Exchange Forwarding Most Common – Done by Administrator
2. Inbox Rule – Done by User
3. Hub Transport Rule – Done by Administrator

1 and 3 can be checked easily and there will be references of when this is done and not done usually in tickets , however users can enable Inbox rules by themselves then contact your later to disable the forward.

Here is how to check for forwarding or redirecting rules on mailbox in 365

 foreach ($i in (Get-Mailbox -identity %USERNAME%))
 { Get-InboxRule -Mailbox $i.DistinguishedName | where {$_.ForwardTo} | fl MailboxOwnerID,Name,ForwardTo }

  foreach ($i in (Get-Mailbox -identity %USERNAME%))
 { Get-InboxRule -Mailbox $i.DistinguishedName | where {$_.ReDirectTo} | fl MailboxOwnerID,Name,RedirectTo}

To Disable

Disable-InboxRule -Identity "%NAME OF RULE%" -Mailbox "%USERNAME"
 

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