We are on final phase of AD and Exchange Cross Forest migration. lately, we recieved a complain from that he unable to send email to certain group of user. E.g. This user was involved on the new project and the email from send by migrated mailbox user (at target domain) and send to this user and CC: several users (not yet migrate and already migrate). This user able to receive this email while when he try tp reply/fw he did received below error: The bouncing mail was from System Administrator Your message did not reach some or all of the intended recipients. Subject: FW: FW: Request for Quotation- MP4 and Wrist watch (RO 12541) Sent: 22/3/2011 4:07 PM The following recipient(s) cannot be reached: User C (Migrated User) on 22/3/2011 4:44 PM None of your e-mail accounts could send to this recipient. Please advice

What versions of Exchange are involved here? Make sure that the sender isn't administratively prohibited send to User C via delivery restrictions. Make sure that User C has valid e-mail addresses. Check the distribution group membership and ensure that the proper User C account is present as a member. Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi Ed, I'm running on Exchange 2007 and I found this link http://social.technet.microsoft.com/Forums/en-US/exchangesvrclients/thread/ebb37de3-2668-4e39-a419-7c78b10dbcf4/ But I not sure why need related to restart MS Information Store? It is related. I run on CCR enviroment and with NLB Exchange Hub/CAS. Recently, last month I did create new Send Connector on Exchange Hub for third party application but the problem report recently. I have problem to contact the user since they are on vessel. Please advice.

Hi Suriya, Per your description, I would do some test as below: 1. recreate the profile for the user, and then make a test 2. it seems that the sender could not resolve the recipients successfully, it maybe caused the cache on the client end, how about delete the nk2 file and then make some tests 3. how about send the email through OWA, We could narrow down the issue then. Regards! Gavin Please 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.

IS this realated one user migrated or for all the users facing the same issue when migrated ?