Links: September 24, 2012

Last week Return Path announce a new set of email intelligence products. One of their new products offers customers the chance to actually see how (some subset of) their customer base interacts with mail directly. It moves beyond simply looking at probe mailboxes and actually looks inside the mailbox of recipients.
Spamhaus has listed bit.ly on the Domain Blocklist (DBL) for allowing spammers to abuse their redirector service. Spammers have been abusing bit.ly for a while, and I’m a little surprised it’s taken so long for a listing to happen. Steve wrote a post last year about URL redirectors and offered suggestions on what to do to avoid blocking problems when using a URL shortening service.
Real Insights has a very interesting post on why it should be “hard” to subscribe to your mailing list. There are also a number of good suggestions about the subscription process itself. Definitely worth a read.

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Spamtraps are not the problem

Often clients come to me looking for help “removing spamtraps from their list.” They approach me because they’ve found my blog posts, or because they’ve been recommended by their ISP or ESP or because they found my name on Spamhaus’ website. Generally, their first question is: can you tell us the spamtrap addresses on our lists so we can remove them?
My answer is always the same. I cannot provide a list of spamtrap addresses or tell you what addresses to remove. Instead what I do is help clients work through their email address lists to identify addresses that do not and will not respond to offers. I also will help them identify how those bad addresses were added to the list in the first place.
Spamtraps on a list are not the problem, they’re simply a symptom of the underlying data hygiene problems. Spamtraps are a sign that somehow addresses are getting onto a list without the permission of the address owner. Removing the spamtrap addresses without addressing the underlying flaws in data handling may mean resolving immediate delivery issues, but won’t prevent future problems.
Improving data hygiene, particularly for senders who are having blocking problems due to spam traps, fixes a lot of the delivery issues. Sure, cleaning out the traps removes the immediate blocking issue, but it does nothing to address any other addresses on the list that were added without permission. In fact, many of my clients have discovered an overall improvement in delivery after addressing the underlying issues resulting in spamtraps on their lists.
Focusing on removing spamtraps, rather than looking at improving the overall integrity of data, misses the signal that spamtraps are sending.

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Spamhaus dDOS

I got mail late last night from one of the Spamhaus peeps telling me that they were under a distributed Denial of Service (dDOS) attack. This is affecting email. Incoming email is delayed and they’re having difficulty sending outgoing email. This is affecting their responses to delisting queries.
They are working on mitigation and hopefully will be fully up and running soon.
Updates when I get them.
Update (8/29/2012): mail to Spamhaus should be back.

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New Spamhaus lists

Spamhaus announced today they are publishing two new BGP feeds: Extended DROP and the Botnet C&C list. These lists are intended for use inside routers in order to stop all traffic to or from listed IP addresses. This is a great way to impact botnet traffic and hopefully will have a significant impact on virus infections and botnet traffic.
In other news I’ve been hearing rumbling about changes at Yahoo. It looks like they have changed their filters and some senders are feeling lots of pain because of it. It looks like senders with low to mid range reputations are most affected and are seeing more and more of their mail hit the bulk folder. This afternoon I’m hearing that some folks are seeing delivery  improvements as Yahoo tweaks the changes.

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