Sharing content, sharing reputation

Over at SpamResource Al talks about how sharing content is like sharing needles.

If you’re going to share email templates with somebody else, you’re sharing in their reputation. Lots of good spam filters, like those at Cloudmark, Brightmail, Yahoo and elsewhere, they use what is commonly called “content fingerprinting.”

Content fingerprinting is something that a lot of people don’t talk about. However, it is the logical next step to deal with spammers who spend a lot of time attempting to work around IP based reputation. It is also why a number of senders with good reputation can see random poor delivery.
The moral of the story is be careful of who you allow to advertise in or generate content for your newsletters. Otherwise, you may see your delivery suffer.

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How reputation and content interact

Recently, one of my clients had a new employee make a mistake and ended up sending newsletters to people in their database that had not subscribed to those particular newsletters. This resulted in their recipients getting 3 extra emails from them. These things happen, people fat-finger database queries or aren’t as careful with segmentation as they should be.
My clients were predictably unhappy about sending mail their users hadn’t signed up for and asked me what to do to fix their reputation. I advised they not do anything other than make sure they don’t do that again. The first send after their screw-up had their standard 100% inbox delivery. The second send had a significant problem with bulk foldering at Hotmail and Yahoo. The third send had their standard 100% inbox delivery.
So what happened on the second send? It appears that on that send they had a link or other content that “filled the bucket.” Generally, their IP reputation is high enough that content isn’t sufficient to send their mail into the bulk folder. However, their reputation dipped based on the mistake last week, and thus the marginal content caused the bulk foldering.
Overall, these are senders with a good reputation. Their screw up wasn’t enough to damage their delivery itself, but may have contributed to all their mail going into the bulk folder the other day. I expect that their reputation will rebound quickly and they will be able to send the same content they did and see it in the inbox.

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Contact addresses and spam

One of the challenges anyone doing business on the internet faces is how to provide contact information so that potential customers can reach you in a form that spammers can’t easily abuse. Contact forms are the classic method, but they can (and are) abused by spammers. We decided to try something different. About 2 months ago, we started using rotating contact addresses. Every day a new address is deployed on the contact form on our website. Each address is valid for a fixed period of time, and is then retired.
This seems to be working well for us. Spammers are harvesting the email addresses, but because they are only valid for a fixed period of time, the amount of spam in my mailbox is not overwhelming. I am spending less time searching for sales mails through spam. An interesting side effect is I can actually see who is harvesting addresses and spamming.
It’s not perfect, I’m still getting spam to that address. But it’s spam at a level where I’m not losing real mail.

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Spam that's not spam

Steve and I were talking this evening and I mentioned to him that I got “a lot of spam that wasn’t really spam. Know what I mean?”
He did. But if I tell that to you, what does it mean to you?
More on this in a couple days, but I’m onsite at a client’s for the next few days so it may take me a plane ride home to put all the thoughts down.

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