Spamfilters: a marketer's best friend

I was cleaning out my spam folder this afternoon. I try and do it at least once a day, otherwise the volume gets so bad I don’t actually look at the mail I just mark it all as read. I realized, though, that spamfilters are actually a marketer’s best friend.
If there were no spam filters keeping all the crap people get out of their inbox (in my case over 1000 messages a day) then spam would overwhelm even the most dedicated email junkie. I couldn’t do my job without my spam filters, and in fact the recent rash of virus spew is ending up in my inbox and making finding real mail a problem. I do a lot of sorting before mail ever hits my inbox, and I’m still struggling to deal with the couple hundred “your order has shipped!” and “please her tonight!” emails that my local bayesian filters haven’t caught up to, yet.
Today’s stats:
Work inbox: 17 messages
Work spam: 419
95.9% spam
Personal inbox: 40
Personal spam: 975
95.9% spam
Without filters, I couldn’t accurately find that 4.1% of real mail that I get. Without filters, I couldn’t do my job. Without filters, I couldn’t find the real receipts from purchases I actually made. Without filters, I couldn’t read and respond to mail I wanted.
A mailbox overflowing with spam is unuseable, and email marketers should be thankful that providers work so hard to keep spam out. Otherwise, email wouldn’t be useful for anything.

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Poor delivery can't be fixed with technical perfection

There are a number of different things delivery experts can do help senders improve their own delivery. Yes, I said it: senders are responsible for their delivery. ESPs, delivery consultants and deliverability experts can’t fix delivery for senders, they can only advise.
In my own work with clients, I usually start with making sure all the technical issues are correct. As almost all spam filtering is score based, and the minor scores given to things like broken authentication and header issues and formatting issues can make the difference between an email that lands in the inbox and one that doesn’t get delivered.
I don’t think I’m alone in this approach, as many of my clients come to me for help with their technical settings. In some cases, though, fixing the technical problems doesn’t fix the delivery issues. No matter how much my clients tweak their settings and attempt to avoid spamfilters by avoiding FREE!! in the subject line, or changing the background, they still can’t get mail in the inbox.
Why not? Because they’re sending mail that the recipients don’t really want, for whatever reason. There are so many ways a sender can collect an email address without actually collecting consent to send mail to that recipient. Many of the “list building” strategies mentioned by a number of experts involve getting a fig leaf of permission from recipients without actually having the recipient agree to receive mail.
Is there really any difference in permission between purchasing a list of “qualified leads” and automatically adding anyone who makes a purchase at a website to marketing lists? From the recipient’s perspective they’re still getting mail they don’t want, and all the technical perfection in the world can’t overcome the negative reputation associated with spamming.
The secret to inbox delivery: don’t send mail that looks like spam. That includes not sending mail to people who have not expressly consented to receive mail.

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Ownership of the inbox

Marketers often treat recipient inboxes with a certain level of ownership. They talk about getting mail to the inbox with the underlying implication that inboxes are for use by marketers and they tend to forget that recipients use email for a lot of things, not just being marketing targets.
This was crystallized for me a few years ago when I was running a conference session. The session had a very diverse group of attendees and as part of the session they broke up into smaller groups to talk about various email related topics. One of the questions was how do people use email. Those groups with more ISP representatives produced a list with dozens of ways people use email. The groups dominated with email marketers, though, came up with a much more limited set of uses, all of them related to marketing or commerce. They didn’t mention mailing lists or one on one discussions or connecting with friends as part of the things people use email for.
Marketers seem to forget that email was not adopted by users so they could be marketed to. In fact, email is primarily used by people to interact with friends, colleagues, allies and family members. Most recipients really don’t really care about marketing in their inbox. They’re much more interested in the mail from mom with pictures of the new puppy. They’re looking for that mail from a friend linking to a silly video. They’re deeply involved in an online discussion with friends or colleagues about anything at all.
This doesn’t mean they don’t want marketing in their inbox. Every subscription is an invitation to visit the recipient’s mailbox. They are inviting a sales person to visit them at home or at work;  spaces where marketers are not traditionally invited.
The problem is that a lot of email marketers do not respect the space they’ve been invited into. They assume, usually incorrectly, they are being given ownership of that space. The marketer sees the inbox as their marketing space, not as space that the recipient feels ownership over.
When someone buys a magazine or watches TV, there are a lot of ads, but that’s OK because they don’t feel any ownership of those spaces. But when they subscribe to something in email, they don’t cede ownership of their inbox to the senders. It is still their inbox and marketers are there only because the recipient invited them. The recipient will kick marketers out if they start writing on the walls or otherwise disrespecting their space.
Many delivery consultants talk about engagement and sending timely, relevant email. All of those are really coded phrases meaning “when you’re invited into somebody’s house don’t scrawl on the walls or poop on the carpets.”

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Why do ISPs do that?

One of the most common things I hear is “but why does the ISP do it that way?” The generic answer for that question is: because it works for them and meets their needs. Anyone designing a mail system has to implement some sort of spam filtering and will have to accept the potential for lost mail. Even the those recipients who runs no software filtering may lose mail. Their spamfilter is the delete key and sometimes they’ll delete a real mail.
Every mailserver admin, whether managing a MTA for a corporation, an ISP or themselves inevitably looks at the question of false positives and false negatives. Some are more sensitive to false negatives and would rather block real mail than have to wade through a mailbox full of spam. Others are more sensitive to false positives and would rather deal with unfiltered spam than risk losing mail.
At the ISPs, many of these decisions aren’t made by one person, but the decisions are driven by the business philosophy, requirements and technology. The different consumer ISPs have different philosophies and these show in their spamfiltering.
Gmail, for instance, has a lot of faith in their ability to sort, classify and rank text. This is, after all, what Google does. Therefore, they accept most of the email delivered to Gmail users and then sort after the fact. This fits their technology, their available resources and their business philosophy. They leave as much filtering at the enduser level as they can.
Yahoo, on the other hand, chooses to filter mail at the MTA. While their spamfoldering algorithms are good, they don’t want to waste CPU and filtering effort on mail that they think may be spam. So, they choose to block heavily at the edge, going so far as to rate limit senders that they don’t know about the mail. Endusers are protected from malicious mail and senders have the ability to retry mail until it is accepted.
The same types of entries could be written about Hotmail or AOL. They could even be written about the various spam filter vendors and blocklists. Every company has their own way of doing things and their way reflects their underlying business philosophy.

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