"We usually don't see much of the scammy spam and malware", writes Peter Hansteen, "But that one time we went looking for them, we found a campaign where our OpenBSD greylisting setup was 100% effective in stopping the miscreants' messages." The article The Voicemail Scammers Never Got Past Our OpenBSD Greylisting shows how that scammy spam campaign looked like from behind a simple greylisting setup, with links to relevant data and articles.
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