>Thanks for this help. Just to make sure I understand though ...

>All I need to do to act as a backup mail server is:
>
>1. Set SMTP Security to "Relay Mail for ... Addresses"; and

yes

>2. Put in a new line in my hosts file for each domain to be backed up, for
>example:
>xxx.xxx.xxx.xxx  primaryserver1.com
>xxx.xxx.xxx.xxx  primaryserver2.com

yes

>I understand, of course, that the DNS records have to be set up with my
>server as an MX record with the correct priority.

yes

>I also understand I could
>put in other selections on the SMTP Security tab

no you can't. IIRC, RTFM says you MUST "relay for addresses" for Imail to 
be backup MX or mail gateway.

>but "Relay Mail for ...
>Addresses" seems to be the best option to avoid open relay issues.

only = best = only

Len

http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-abuse mail gateways


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