Spam filtering tip

I’ve noticed that more than two thirds of the spam I receive contains a Thread-Index header beginning with the characters Aca6. Filtering on that header can eliminate much of my spam. Since I use Procmail on my DreamHost mailbox, I added the following rule and found that it got rid of most of my spam with no false positives:

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* ^Thread-Index:.*Aca.*$
/dev/null

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