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Originator:	PaulHews	Printable Version
Title:	Broken email

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From: PaulHews	On: 2006/12/12 14:42:18
Recently a number of contacts have been telling me that they are getting error 550 bouncebacks when sending to my ISP email address. I've been complaining on their support forum, but some guy (who may or may not be from the company) is telling me that the domains of the people sending are blocked from connections for a period of time because of IP reputation filtering. Trouble is, the domains being blocked are all over the place: Universities, cable companies, mac.com, etc. Is blocking whole ISP domains from connecting with your mail servers a valid way to fight spam, or is this guy just blowing smoke?

From: stone5150	On: 2006/12/12 14:50:45
It is a way of fighting spam. Albeit a very stupid and ineffective way, but one that is employed nonetheless by some companies. There is a company callled Spamcop (or something like that) that uses that technique. It is complete bullshit if you asked me. Have they never heard of spoofing or dynamic IPs?

From: Pino Carafa	On: 2006/12/13 02:14:59
It's a way of throwing the baby away with the bath water. I've noticed this myself. It's really not acceptable.

From: Pino Carafa	On: 2006/12/13 02:16:25
And Stone, you're damn right. Real spammers will spoof IPs, and all they'll achieve is inconveniencing genuine users.

From: PaulHews	On: 2006/12/13 11:39:51
The latest from this poster. As far as I can tell he actually works at my ISP. The IP filtering is based on the connecting IP, not the originating IP since that information can be spoofed in a header. And I agree with you that it created a situation where many are punished by the few. But that's been problem throughout history, so you shouldn't be surprised that this type of logic extends to an Internet service. However, it's a domain's responsibility to protect their own network for those very reasons as much as it's Bell responsibility to protect their's. If a network refuses to do any type of outbound filtering or force their users to use the ISP's SMTP server, then they're asking for trouble. Over 750,000 domain's user IP reputation filtering. You may not like it, but's it's an industry standard that's been widely accepted and found most effective at fighting spam. I find it hard to believe that the big cable companies and universities are worse at filtering outbound spam than my ISP.

From: Pino Carafa	On: 2006/12/13 15:37:02
exactly

From: PaulHews	On: 2006/12/14 07:05:58
This conversation is now closed.

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