Had same problem on 1.07 Firmware. except it's trying to send an e-mail to "NAS_E-Mail_Alert@D-Link[mydomain].com"
Upgraded to 1.08, same problem.
Played with some of the settings. It appears to be pulling from the Sender E-mail settings, as NAS_E-Mail_Alert stays the same, but follows whatever domain name I enter.
More of an annoyance than anything else, but it's comforting to know I'm not alone!