Comments on: Why is it Really So Hard to Tackle Spam?

By: Understanding Blocklist Providers

Understanding Blocklist Providers — Thu, 13 Aug 2009 13:00:19 +0000

[...] my last blog post Why Is It Really So Hard to Tackle Spam I mentioned that a lot of spam originates from compromised home computers, not email servers, and [...]

By: RobertSeattle

RobertSeattle — Fri, 07 Aug 2009 18:44:32 +0000

I agree with Donovan, for the most part, no legitimate email should becomeing from a dynamic IP address pool, and those “legitimate” that are dynamic (perhaps like from a webcam on an dynamic IP that sends out an email when activity occurs) should be white listed manually.

By: Donovan Hill

Donovan Hill — Thu, 06 Aug 2009 23:26:25 +0000

Having been an email admin for a small (and now defunct) ISP, I found the most effective thing to preventing spam was to start by using a list like spamhaus, then block connections from hostnames that read like “ppp” or “client” or “dynamic” or any other indicator of a consumer internet connection. The final step was to block subnets as the spam came in. It was a lot of work for the first few months, but then is slowed down until I was spending maybe an hour a week dealing with the problem.