Wouldn't this be far easier accomplished by using the
mydestination setting? That's how you control which hosts you accept mail for.
It's also a good idea to have a local caching resolver running anyway, especially if you have multiple machines in your local network. I use Bind, and have it forward unknown requests to my ISP. Those are then cached locally.
forwarders {
1.2.3.4;
2.3.4.5;
};
I can also heartily recommend implementing dns blacklists in your smtp daemon. I'm very, very happy with zen.spamhaus.org, which drops about 75% of incoming spam. I also use some of the rfc-ignorant.org blacklists, but haven't really seen much benefit of it.
Top it all off with bogofilter or another (bayesian) spam filter, and email life is good again. I see no spam in my inbox, and only have about 5 to 10 emails per day that the spam filter couldn't classify. I can live with those numbers!
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