A good 5-6 years ago, I got e-mail from my ISP saying my computer was infected.
I went and checked every computer I had. Went so far as scanning with a security tool that wasn't publicly available. Nothing. Nada. Squat. Everything was fine.
After an hour on the phone with them, finally getting escalated to someone with a clue, we diagnosed the "problem". My Spam Assassin install was DoSing their servers because they cached every negative request to blackhole lists instead of applying logic to it.
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