I opined about a year ago that DNS blacklists wouldn't work for mail that runs over IPv6 rather than IPv4. The reason is that IPv6 has such a huge range of addresses that spammers can easily send every message from a unique IP address, which means that recipient systems will fire off a unique set of DNSBL queries for every message... Now I'm much less sure this will be a problem... more
As unusual as it may be for a lawyer to speak at a IETF meeting, Ian Walden gave a lecture on Data Protection Directives and updates thereof. He said they affect some 90 jurisdictions. A difference between email addresses and cookies - the latter are the main subject of the January 2012 update of the directives - is that after more than a decade of enforcement, specific browser extensions may allow users to browse what cookies they have, while no record states whom they conferred their email addresses to. more
I recently had a chance to read a report titled, "Show Me the Money: Characterizing Spam-advertised Revenue" produced as a joint effort from the University of California, San Diego (UCSD), International Computer Science Institute, and UC Berkeley by Chris Kanich, Nicholas Weaver, Damon McCoy, Tristan Halvorson, Christian Kreibich, Kirill Levchenko, Vern Paxson, Geoffrey M. Voelker and Stefan Savage. I also had a chance to hear Chris Kanich speak about the topic - Show Me The Money! This post contains my notes with some photos taken from that report. more
Courtesy forwards have been a standard feature of e-mail systems about as long as there have been e-mail systems. A user moves or changes jobs or something, and rather than just closing the account, the mail system forwards all the mail to the user's new address. Or a user with multiple addresses forwards them all to one place to be able to read all the mail together. Since forwarding is very cheap, it's quite common for forwards to persist for many years. Unfortunately, forwarding is yet another thing that spam has screwed up. more
Sometimes I hear people or read writers that say things about spam that are incorrect. I thought I would clear those up in this blog post... When the holidays roll around, people start warning other people to watch their inboxes - December is spam season! By that, they mean that more spam than normal flows around the Internet. People say this because December is the holiday season. Since spam is another form of advertising, and advertisers pepper us with ads during this time, then spammers must do the same. It makes sense except it's not true. more
As the WHOIS debate rages and the Top-Level Domain (TLD) space prepares to scale up the problem of rogue domain registration persists. These are set to be topics of discussion in Costa Rica. While the ICANN contract requires verification, in practice this has been dismissed as impossible. However, in reviewing nearly one million spammed domain registrations from 2011 KnujOn has found upwards of 90% of the purely abusive registrations could have been blocked. more
Over the last year the world has been virtually buried under news items describing hacks, insecure websites, servers and scada systems, etc. Each and every time people seem to be amazed and exclaim "How is this possible?" Politicians ask questions, there is a short lived uproar and soon after the world continues its business as usual. Till the next incident. In this blog post I take a step back and try to look at the cyber security issue from this angle... more
I wonder how much botnets reuse IP addresses. Do they infect a system and spam, get blocked, discard the IP and move onto the next (new) one? This means that they have a nearly unlimited supply of IP addresses. Or do they infect a system and spam, get blocked, and then let it go dormant only to awaken it some time later? I decided to take a look. more
A consortium of companies including Google, Microsoft, Facebook and Paypal have announced that they were collaborating and coming up with a new protocol known as DMARC -- the Domain-based Message Authentication, Reporting and Conformance. What is DMARC? more
My mail server has a lot of spamtraps. They come from various sources, but one of the most prolific is bad addresses in personal domains. Several of my users have their own domains, such as my own johnlevine.com, in which they use a handful of addresses. Those addresses tend either to be people's first names, for individual mailboxes, or else the names of companies. If I did business with Verizon (which I do not) I might give them an address like [email protected]. All those domains get mail to lots of other addresses, which is 100% spam. more
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