Email filters

What makes the best email filter? There isn’t really a single answer to that question. Different people and different organizations have different tolerances for how false positives versus false negatives. For instance, we’re quite sensitive to false positives here, so we run extremely conservative filtering and don’t block very much at the MTA level. Other people I know are very sensitive to false negatives and run more aggressive filtering and block quite a bit of mail at the MTA level.
For the major ISPs, the people who plan, approve, design and monitor the filters usually want to maximize customer happiness. They want to deliver as much real mail as possible while blocking as much bad mail. Blocking real mail and letting through bad mail both result in unhappy customers and increase the ISP’s costs, either through customer churn or through support calls. And this is a process, filters are not static. ISPs roll out new filters all the time, sometimes they are an improvement and sometimes they’re not. When they’re not, they’re pulled out of production. This works both for positive filters like Return Path and negative filters like blocklists.
Then there is mail filtering that doesn’t have to do with spam. Business filters, for instance, often block non-business mail. Permission of the recipient often isn’t even a factor. Companies don’t often go out of their way to block personal mail, but if personal mail gets blocked (say the vacation plane ticket or the amazon receipt) they don’t often unblock it. But when you think about why a business provides email, it makes perfect sense. The business provides email to further its own business goals. Some personal usage is usually OK, but if someone notices and blocks personal email then it’s unlikely the business will unblock it, even if the employee opted in.
In the case of email filters, the free market does work. Different ISPs filter mail differently. Some people love Gmail’s filters. Other people think Hotmail has the best filtering. There are different standards for filtering, and that makes email stronger and more robust. Consumers have choices in their mail provider and spamfiltering.

Further amendment would be futile
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Gmail and the PBL

Yesterday I wrote about the underlying philosophy of spam filtering and how different places have different philosophies that drive their filtering decisions. That post was actually triggered by a blog post I read where the author was asking why Gmail was using the PBL but instead of rejecting mail from PBL listed hosts they instead accepted and bulkfoldered the mail.
The blog post ends with a question:

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The answer is 42

I continually run into companies that don’t really have a goal or understanding of their email marketing program. They’ve never really asked questions about how they’re using email or even why email is the right answer. Lots of companies are also diving head first into email marketing or the social media craze without having thought about what their goals are and what they want to happen.
What regularly ends up happening to companies that jump in without a clear goal is they get into a situation where their delivery is bad. Then they read a lot of best practice advice on the net and try to implement all of it. Sometimes that works, but other times it doesn’t. Finally they hire me or another consultant to help them sort out where it all went pear shaped.
My consulting isn’t about rote recitation of common best practices. Instead, I want to know about a client’s business and what they think about email.  The most frequent question I ask clients is: How does email fit into your business? What are your goals for your business? What is your value proposition?
Some of my clients can’t answer these question. They just tell me they want to use email and they don’t know what they’re doing and that’s why they hired me. Well, I can help them successfully send email, but I can’t help them decide what role email plays in their business. Those are the decisions my client needs to make. I can’t set their business goals for them.
When was the last time you actually sat down and just thought about your business goals? I know that sometimes it’s hard to find the time to look at your business and where it’s going. “Think about it? I’m too busy doing it!” But every business person needs to look at their business goals.
Once you’ve thought about your goals, think about your email marketing program. Is email helping you to reach those goals? How?
If you’ve reached your current business goals, what are your next ones? And how does email fit into those goals?
Sure, having an answer is good, but are you actually asking the right question?

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We're gonna party like it's 1996!

Over on deliverability.com Dela Quist has a long blog post up talking about how changes to Hotmail and Gmail’s priority inbox are a class action suit waiting to happen.
All I can say is that it’s all been tried before. Cyberpromotions v. AOL started the ball rolling when they tried to use the First Amendment to force AOL to accept their unsolicited email. The courts said No.
Time goes on and things change. No one argues Sanford wasn’t spamming, he even admitted as much in his court documents. He was attempting to force AOL to accept his unsolicited commercial email for their users. Dela’s arguments center around solicited mail, though.
Do I really think that minor difference in terminology going to change things?
No.
First off “solicited” has a very squishy meaning when looking at any company, particularly large national brands. “We bought a list” and “This person made a purchase from us” are more common than any email marketer wants to admit to. Buying, selling and assuming permission are par for the course in the “legitimate” email marketing world. Just because the marketer tells me that I solicited their email does not actually mean I solicited their email.
Secondly, email marketers don’t get to dictate what recipients do and do not want. Do ISPs occasionally make boneheaded filtering decisions? I’d be a fool to say no. But more often than not when an ISP blocks your mail or filters it into the bulk folder they are doing it because the recipients don’t want that mail and don’t care that it’s in the bulk folder. Sorry, much of the incredibly important marketing mail isn’t actually that important to the recipient.
Dela mentions things like bank statements and bills. Does he really think that recipients are too stupid to add the from address to their address books? Or create specific filters so they can get the mail they want? People do this regularly and if they really want mail they have the tools, provided by the ISP, to make the mail they want get to where they want it.
Finally, there is this little law that protects ISPs. 47 USC 230 states:

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