Hi Best,
The OOF assistant only applies to internal users, meaning that the senders
in the same org can receive this OOF notification, but the external senders
will not receive this. This is the default setting in Exchange server
because that sometimes your personal state may be a confidential.
If this is the case, please refer to this KB article to enable external OOF
by using a server rule in Outlook client-side.
311107 How to emulate the Out of Office Assistant in Microsoft Outlook
http://support.microsoft.com/?id=311107
Also, we can change the option in Exchange server-side to enable external
OOF notification.
821899 How to Enable Out-of-Office Reply Messages to the Internet
http://support.microsoft.com/?id=821899
Hope it helps.
Regards,
Pat Cai
Microsoft Online Partner Support
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