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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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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9th circuit ruling in Gordon v. Virtumundo

The 9th circuit court of appeals issued their ruling in Gordon v. Virtumundo today. The ruling was heavily in favor of Virtumundo. I have not had time to read the ruling, but both Venkat and Mickey have posts on the case and the ruling.
This is another solid blow against anti-spammers suing spammers under state laws and CAN SPAM. The problem is that many of the cases are brought by people, and lawyers, who fail to understand that just because they don’t like something doesn’t make it illegal. Spammers do a lot of bad things, but the ones you can track enough to sue are generally not breaking the law. Sadly, cases like Gordon and Mummagraphics makes it harder for ISPs to sue spammers that are actively harming the ISP and the customers.

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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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