I have a Sendmail (8.13.4) server running Symantec Brightmail Anti-Spam at the gateway. It relays all mail to an Exchange 2003 server on the backend to user mail boxes. Everthing works fine except for when I take the exchange server down for a reboot. Is there a way to make it so that when I reboot the exchange server that the sendmail will queue mail on its end until the Exchage server comes back up? Right now I think I am waiting on retries from the sending mail server. I would like to queue them on my end if possible.