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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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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Delivery lore

Number of people believing outrageous statements on the Internet
(Image from Bad Astronomy)
Almost every delivery consultant, delivery expert or deliverability blog offers their secrets to understanding spam filters. As a reader, though, how do you know if the author knows what they’re talking about? For instance, on one of the major delivery blogs had an article today saying that emails with a specific subject line will not get past spam filters.
This type of statement is nothing new. The lore around spam filters and what they do and do not do permeates our industry. Most of the has achieved the status of urban legend, and yet is still repeated as gospel. Proof? I sent an email with the subject line quoted in the above blog post to my aol, yahoo, gmail and hotmail accounts. Within 3 minutes of sending the email it was in the inbox of all 4 accounts
I can come up with any number of reasons why the email ended up in my inbox, rather than being caught by spam filters as the delivery expert originally claimed. But none of those reasons really matter. The expert in question is spreading delivery lore that is demonstrably false. Emails with that subject line will get through spam filters. I even added an extra 4 exclamation points in the subject line.
Not all delivery lore is true. In fact, most lore involving “always” “all” “never” or “none” is not going to be true. Just because you read it on the internet, and because it came from someone claiming to know what they’re talking about does not absolve individual senders from critically thinking about the information.

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10 ways spam is like Vuvuzelas

Amir Lev has a great post today detailing the 10 ways that spam is like Vuvuzelas. After reading his reasons (and deleting over 1000 messages from Cutwail), I absolutely agree.

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