Define "spam"

A comment came through recently from Trent asking me to define spam. It’s been a while since I’ve talked about how I define spam, so let’s look at it.
Personally, I describe spam as unsolicited bulk email. If I didn’t ask for it and it looks like bulk mail then I consider it spam. In many cases the spammers have multiple email addresses of mine so I can demonstrate the mail was sent in bulk.
In my consulting and working with clients, though, I rarely use the word spam. There are so many different definitions of spam, I have no way to know if my clients understand what I am saying, so I avoid the term as much as humanly possible. An example of some of the few definitions of spam I’ve seen used over the years.

  • unsolicited bulk email
  • unsolicited commercial email
  • mail I don’t want
  • mail I don’t think my customers want
  • mail that is identical/similar to mail that hit my spamtrap
  • mail that was sent to a non-existent address at my domain
  • mail that contains HTML
  • unsolicited email
  • mail that advertises Viagra or porn sites or similar
  • mail that other people send

With my clients we talk about how the client’s mail is perceived by the various groups and why their mail might be blocked or filtered. For those cases, it’s useful to look at the definitions used by organizations doing the blocking.
Spamhaus and some other blocking lists use “unsolicited bulk email” as their definition. Many of the listings rely on mail to spamtraps. IPs sending mail to addresses not given to anyone, are sending unsolicited and presumably bulk mail. Thus that IP gets listed. They also have other lists that monitor snowshoe behaviour as well as listing domains. Spamhaus, and other blocklists believe that if a mailer is sending one piece of email to a user who did not request it, then they are likely mailing many other users who did not request any mail. This definition centers around permission, and any mail without permission is considered spam.
Many of the large ISPs use “mail our users complain about” as their definition. With this definition, they do not have to argue permission status with a sender. The data shows that their customers complain about mail from that sender or with that URL. The ISPs are going to block, or deliver to the bulk folder, email that their users do not want.
Filters and some blocking lists use “mail that has characteristics of mail we know is unsolicited bulk mail” as their definition. These characteristics can be things like an invalid HELO string, or lack of reverse DNS on the connecting IP address, or badly formatted HTML. Mail that looks like spam, in the technical sense, is often treated like spam.
Spam is a term that means different things to almost everyone. However, to answer your request, Trent: when I mention spam here on the blog without an accompanying explanation of the term, I’m talking about unsolicited bulk email.
This post is an updated version of  What really is spam, anyway?. I also talk about the definition of spam in Defining Spam

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Defining spam

This is a post I’ve put off for a while as the definition of spam is a sticky subject. There are online fora where the definition of spam has been debated for more than 10 years, and if there isn’t a working definition after all that time, it’s unlikely there will ever be a definition the participants can agree on.
This came up again recently because one of the comments on my “Reputation is not permission” post took me to task for daring to call the mail “spam.” I’m going to assert here that the mail was unsolicited bulk email. I did not ask for it and I know at least 4 other people that received it.
The commenter, and a few marketers, argue that if the mail is sent without any forgery and the mail contains an opt-out link then it is not spam. It is a definition I have only seen folks who want to send unsolicited bulk email use, however. What they are really arguing is their mail isn’t spam because they provide a valid return address and a way to opt-out. Few people actually agree with this definition.
Here are 10 of the many definitions of spam that I’ve seen.

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I have been a bit behind on my blog reading recently, and am slowly going through my RSS feed catching up with what everyone has had to say about spam in the last few weeks.
One of the articles that caught my attention was a post from VerticalResponse discussing the response to a marketing campaign from one of their customers. It seems to me the point of the post is to defend the VerticalResponse mail to the customer. The mail VerticalResponse sent was not spam. Why this is true is not made clear, other than the mail was not pills spam, phishing or porn.
Contrasting with that article is a post a friend pointed out to me today. This article goes to the other extreme, and seems to say that any one-to-many email is spam and should not be sent. While trying to find his point, the author does take the step of exempting any opt-in marketing from his definition. The confusing bit is that the statistics he is using are compiled by MailerMailer, who have a very clear anti-spam policy and allow only permission based marketing.
What both posts seem to be missing is that, these days, spam is in the eye of the receiver, not the sender. There are customers who groan every time they receive mail from their vendor. Eventually, they may lash out at a sender and complain about the email. At that point, a sender is now dealing with an angry person, and arguing the mail is no spam is not going to diffuse the situation. On the flip side, there are people who are very happy to receive mail, even advertising and marketing mail, from vendors. Even if they do not “open” the mail (read: load images in the email), they may be opening, reading and acting on the offers in the email.
Email marketing is a valuable tool, when it is done correctly and focuses on the receiver’s needs and wants. It is when marketers ignore the individuals they are mailing that they are more likely to see complaints or problems.

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How Spamfilters Work

AllSpammedUp has a post describing the primary techniques anti-spam filters use to identify mail as spam or not spam. While is this not sender or delivery focused knowledge, it is important for people sending mail to have a basic understanding of filtering mechanisms. Without that base knowledge, it’s difficult to troubleshoot problems and resolve issues.

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