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B
Premium,MVM
join:2000-10-28
| reply to Steve
Re: Interesting quote in the linked article
If you get a chance, maybe you could walk me through the logic, because it never makes sense to me.
A. ISP 1's customers, or malware bots on their machines, start sending spam to thousands of people through open relays on OTHER networks run by OTHER ISPs, for example ISP 2.
B. The complaints start building, and eventually ISP 2 says to ISP 1, "hey, your customer is a spammer -- stop it".
C. ISP 1, rather than deal with the naughty customer, AND rather than telling ISP 2 "close your frickin' relay", decides to globally block port 25 and stop Joe Worker from using JoesCompany's mail server to send mail!
What is the incentive, economic or otherwise, for ISP 1 to block port 25? A sense of responsibility to the Internet culture? What? It certainly doesn't reduce spam coming IN to ISP 1's customers.
-- B
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In a realm outside causality and function | |
Steve
I'm a PC, so shut up
Consultant
join:2001-03-10
Yorba Linda, CA
| reply to B
said by B  :I think Steve's mistaken. Curiously, Steve thinks he's not  Certainly, I think the real reason for Port 25 blocks is to keep people wed to the ISP's services on all fronts. Oh gasp, no way: ISPs hate the extra load on their mailservers that 25/tcp blocking requires - it increases their infrastructure costs, makes customers unhappy, etc. I think every one would rather not deal with it, but the spam problem has forced their hand.
Steve
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Stephen J. Friedl • Unix Wizard • Microsoft Security MVP • Tustin, California USA • my web site | |
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