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Source: v3 - Posted by Alex   
Security Symantec Hosted Services responds to reader anger. readers have reacted angrily to suggestions from security firm Symantec Hosted Services that a lack of knowledge and awareness about how to use Linux mail servers could be contributing to the disproportionately large number of Linux machines being exploited to send spam. Symantec malware data analyst Mat Nisbet argued in a blog post last week that many companies running Linux to keep costs down "have not realised that leaving port 25 open to the internet also leaves them open to abuse".

Nisbet suggested that companies should "make sure that the systems are correctly set up to restrict access on port 25 to only authorised users" to limit the amount of spam being sent.

However, several readers disagreed. One, known as uxp, said: "Port 25 is not the problem. It's like saying all XSS attacks can be solved by closing port 80."

Another, Eric Moreau, said: "How can you implement a mail server and not [leave] port 25 open?", while GC wrote: "If you block port 25 the whole email system will grind to a halt. Port 25 is the SMTP port used by email servers to exchange email."

However, Symantec Hosted Services senior analyst Paul Wood defended the firm's research and its advice.

Read this full article at v3

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