Hi, I am using Exchange 2010 SP1 . Recently I have remove one of users mailbox . Next day i re-create it but after that all internal users are getting bounce back messages when they try to send mail to that user from outlook. I tried to delete cache file of one o users outlook but it wont help. I knw some thing about legacy exchange dn address i have to add as X500 but i am not clear on that. Kindly guide me for the same. Also I would like to know why this issue occurs and what is permanant fix for it. Thanks in advance. Mandar Bhosale

Check this and post the result. http://fawzi.wordpress.com/2008/04/11/exchange-2007-delivery-has-failed-to-these-recipients-or-distribution-lists/ Cheers, Gulab | MCTS-MCITP Messaging: 2010 | MCTS-MCITP Messaging: 2007 | MCC 2011 | Skype: Gulab.Mallah | Blog: www.ExchangeRanger.blogspot.com

This issue can occur because the auto-complete cache uses X.500 addresses for e-mail sent to addresses within the Exchange organization. After removing the old use mailbox, the old X.500 address in auto-complete cache is missing. To fix the problem, please refer to the following article: http://www.simple-talk.com/sysadmin/exchange/exchange-e-mail-addresses-and-the-outlook-address-cache/ Thanks. NovakPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.