This is a delivery status notification, automatically generated by MTA eim2.nttcom.co.jp on Fri, 16 May 2008 00:55:30 +0900 Regarding recipient(s) : 3b68b879.b3ea247e(a)nttcom.co.jp Delivery status : Failed. Message could not be delivered to domain <nttcom.co.jp> .Failed while initiating the protocol. <[(&#39;3b68b879.b3ea247e(a)nttcom.co.jp&#39;, 550, '5.1.1 <3b68b879.b3ea247e@nttcom.co.jp>... User unknown')]> MTA Response :550 The original message headers are included as attachment.