Dear all, We have exchange 2000 implemented in Front-end-Backend format. 4 days back our Backend exchange crashed. I installed a new exchange server on a different machine and restored offline backup of the server which crashed. The very next day we installed exchange on the older box (on which exchange had crashed). Exchange got installed peacefully, offline database got restored. Users mailboxes were connected without any problem. Users were also able to open their mailboxes. When we checked internal and external mail flow we found that mails were able to come in but we had problems in sending messages out to internet. We were able to send mails to users internally but whenever we sent messages to internet the message went in the queue "Mails with unreachable destination" We were not able to send messages to front end server. Even exchange in other sites had messages in the queue "unreachable destination" Finally we had to move back to the new server. The sequence of event was as follows: Server 1 with the name Exch1 crashed. Server2 with the new name Exch2 installed Database of Server1 restored at Server2 ---------------------------------------------------------- Server-installed with the name Exch1 Database of Server2 restored at Server1 Any help on the above would be highly appreciated. Regards..Anil