Just wanted to say, Greylisting works! I have some old email addresses that have been on my web pages for years. I typically get about 3,000 spam a week. I can see a difference when researchers take out a big spam botnet.
I installed PostGrey this week on my mail server, skeptical of the difference it would make, but wow. Wow! I now get about 30 spam a week. Fan-freaking-tastic!
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