Restricting mail for certain domains to come from specific ip range

I have some domains on my server that use Postini and some that don't. I'd like to configure the domains that have Postini to only accept mail sent from the postini IP address range.

I can see how I can restrict the smtp addresses server wide but not per domain - is this an option at all?

Thanks in advance



Howdy -- yeah, I unfortunately don't know of a way to do that... it would need to be done from within Postfix, or maybe even SpamAssassin -- but I don't believe either of them offer a ruleset that would allow you to specify what IP addresses to accept mail from, for specific domains.

I'll do a little extra research on that just in case I'm overlooking something, but I don't think there's a way to do that... sorry! :-)