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Hate to say thing, but I too had similar problems. Turns out that postgrey works for a while, but the spammers know how to work it better than you think. So for a few days it worked, then slowly started to degrade back to where I was getting 50+ spams a day that should have been greylisted...

Gave up, postini... $1/month -- more than worth my $$/hour.

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I've worked on a couple of antispam solutions that did something akin to a more intelligent grey listing. Think quality of service meets IP reputation.

The problem with braindead simple things like postgrey is that they are incredibly easy to circumvent and the more attractive a target you are, the quicker the spammers will get around the solution. For instance, if one of the major providers (Yahoo, Hotmail, Verizon, Comcast) were to implement this, spammers would work around it within the hour. If you're low enough on their radar they won't care that they can't get email through to you but as soon as it starts to bother them enough to care, it stops being effective.

This is exactly why I find running your own mail server does not pay off. Fighting spam is a full-time job and should not be taken lightly. Even large enterprises move the majority of their e-mail hosting to cheap providers like Google. (Unless some other company threatens to stop giving you their business if you go that route)

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