Dr. Seamus Phan

Dr. Seamus Phan

Entrepreneur & Author
Joined on November 11, 2003
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Blacklisting Under Wrong Assumptions

If you analyze the relay of spam- and malware-containing email circulating on the Internet purely through your mail server logs (running the Unix command "tail"), a large proportion seem to come from Asia Pacific hosts, especially those from mainland China. Therefore, many less-experienced systems administrators have simply blocked the access from subnets of Chinese or Asian origin, effectively destroying the fabric of the Internet -- messaging. If administrators took pains to analyze these supposedly Asian spam messages by analyzing the full Internet headers, they would have realized that the Asian servers were merely used by the real spammers as open relays, or perhaps as zombie hosts previously infected with the mass mailing worms through the exploitation of operating system vulnerabilities.  more

Topic Interests

DNS IPv4 MarketsCybersecuritySpamMalwareDDoS AttackThreat Intelligence

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Blacklisting Under Wrong Assumptions

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Blacklisting Under Wrong Assumptions