All of my email is now being filtered by Postini, but I cannot (because it's a shared server at an ISP) firewall my mail server to not accept mail from other sources (so, any non-spam that complies with my MX record goes to Postini, but spammers often ignore MX and find a machine (IP address) that accepts mail and will bypass the postini.
I would like to run SpamAssassin on my local machine that would say, if mail did not come through the postini service (these IP addresses), then mark it as SPAM.
Anyone know of how I could create that rule in SpamAssassin?
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