We are working on deploying Exchange 2010. We are new to this so I apologize if I'm missing something obvious.
We have had AD configured for some time now and are now gradually deploying Exchange 2010. We have had users receive the follow NDR:
From: Microsoft Outlook Sent: Wednesday, April 20, 2011 4:42 PM To: Jane Doe Subject: Undeliverable: Quarterlies Delivery has failed to these recipients or groups: Jane Doe <mailto:IMCEAEX-_O%3DWORKPAC_OU%3DEXCHANGE%2B20ADMINISTRATIVE%2B20GROUP%2B20%2ABX8FYD1234SPDLT%2B29_CN%3DRECIPIENTS_CN%3Djdoe@workpac.local> The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.
What exactly are these addresses? The user used auto-complete via Outlook and this is what it resulted in. Some searches lead me to believe it's something from Outlook's cached addres book? But where did it get it from? These are 2 completely new users in a new Exchange 2010 so it's not stale cache.
How do we fix this?