Thanks for all the feedback guys, much appreciated! I believe I have the problem solved. I have configured my backup server as advised Bill, but have also added a rule to forward all mail to a third party email address. The reason I've done this is because if my client goes offline for a long period of time (perhaps a couple of days) the the mail will be lost, correct? I have been unable to find a setting to make the backup server try indefinately until it is answered, without doing the same to normal undeliverable messages on other domains. Can I set a domain-specific rule?
Other than this, the setup seems to be working perfectly fine! Thanks! P.S. I am using XMail Manager 1.0a to manage most of my servers. I find this to be excellent software and well worth the $49US! There's a free version to, but it doesn't have the fancy bits. http://www.encenia.com/products/default.asp - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
