This is a delivery status notification, automatically generated by MTA mailgate1.brunel.ac.uk on Fri, 25 Jul 2008 19:04:02 0100 Regarding recipient(s) : dean.rose@brunel.ac.uk,co97wmh@brunel.ac.uk,dm94bbo(a)brunel.ac.uk Delivery status : Failed. Message could not be delivered to domain <brunel.ac.uk> .Failed while initiating the protocol. <[(&#39;dean.rose(a)brunel.ac.uk&#39;, 550, 'Unknown user'), (&#39;co97wmh(a)brunel.ac.uk&#39;, 550, 'Unknown user'), (&#39;dm94bbo(a)brunel.ac.uk&#39;, 550, 'Unknown user')]> MTA Response :550 The original message headers are included as attachment.