I recently migrated my company onto an Exchange 2007 server. I have a handful of users that sporadically receive the following NDRs: This message could not be sent. Try sending the message again later, or contact your network administrator. The client operation failed. Error is [0x80004005-0x0004b9-0x000501]. I've scoured the 'net for anything and there is virtually nothing out there on this. Does anyone have any valuable information on this? Is there any additional information I can provide? Thanks in advance for any assistance you can provide.
