Hi All My exchange cluster had a server for hub and client access and 2 serves for mailbox. There was a small problem with mail forwarding from one user to other. It was working well till last week. Last time I was setting a mail foraward for one user who is going for vacation. The recipient was a distributed mailbox. During the process I got an error as detailed below. The exchange server address list failed to respond. After this error all other mailbox gives the same error. I belive address list has got some corruption. I request for a quick reply from any of techies here.

Try restarting the System Attendant service on the servers first and see if that fixes the problem.

Agree with Andy, Restarting System Attendant service should fix the issue. Post the update.Gulab | MCITP: Exchange 2010-2007 | Skype: Gulab.Mallah | Blog: www.ExchangeRanger.Blogspot.com

Thanks vey much Andy and Gulab you too. It worked for me and everything is now in good shape. Once again thank you for the quick support . Sabir