Hi All, We have Exchange server 5.5 SP4 working on Windows NT 4.0 SP6a. The problem when a user send a message and it fail to delivered to the destination, the message is held in the server from 2 to 3 days and a non delivered message is returned to the user. Is there any way to reduce the trial time to only one hour? And reply to the user the message in not delivered. Thanks a lot Ashraf