Well, my spam/virus amounts have increased already to over 300 per day, and the unfortunate thing is that around 10-20 of them get through SpamAssassin, ClamAV and Bayesian analysis. So I thought I’d retry greylisting, which means that all MTAs that aren’t already known get a rude “temporarily not available”. If they retry their message later, the message is accepted. This blocks most open relays and viral machines, since they only send the messages once and then forget about them.
However, this will only be a small relief, since much of my mail comes from other sites that just forward the mail to my central staging area. And these sites will handle greylisting quite nicely. I’m still planning on adding recipient whitelisting, meaning that any people I’ve sent mail to get an added non-spam bonus when they send mail back to me.
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