The Voicemail Scam Spam Campaign Never Got Past OpenBSD Greylisting

“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.