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Botnets exploit Linux owners' ignorance

• seven 17y ago
  "This suggests that one reason there is so much spam from Linux could be that many companies that have implemented their own mail servers, and are using open-source software to keep costs down, have not realised that leaving port 25 open to the internet also leaves them open to abuse." So I closed my port 25. This fixed other problems as well. Since then all my customers stopped complaining via email.