Always Send Notice for RX Errors
You can set to inform the sender that the e-mail message or I-fax was not received successfully.
1.
Press 
(Settings/Registration).
(Settings/Registration).2.
Press [Function Settings] → [Receive/Forward] → [Common Settings].
3.
Press [Always Send Notice for RX Errors].
4.
Press [On] → [OK].
Select [Off] if you do not want to inform the sender of the details of the error if an error occurs.