Preventing Spam
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Saturday, October 17th, 2009 (No comments yet) |
Ah… the Internet equivalent to junk mail. Tons of worthless advertisements for products you don't need and don't want. Use my advice to not only help you to stop getting Spam, but to stop helping to spread Spam.
Turn off Images in E-mails
If you read the previous article about e-mail viruses, you know that you can't get a virus from the images in your e-mail, but the images DO help spammers.
They use images to defeat spam filters (which aren't able to "see" what's in an image the same way we do), but worse than that, when an image loads in your e-mail, the spammer or company who sent it has a record that you accessed the image and when. This is bad for several reasons:
- This tells them that your e-mail address is valid.
- They know that whatever trick they used to make you think it was a real e-mail is working.
- They can use the records of the image access to prove to whoever is paying them that people have seen the ad. Don't support the Spammers by letting them get paid!
For all these reasons, turn of images in your e-mail. You can always allow exceptions on a case-by-case basis for regular monthly newsletters or pictures from your family, but find the options in your e-mail to turn off images by default or for untrusted senders (fortunately, some e-mail services are already starting to do this for you).
Keep Your E-mail Address Off of Websites
During my graduate research into Spam (yes, I honestly did graduate research on Spam), I discovered that the most effective way to prevent Spam is to make sure your e-mail address isn't listed on webpages.
It turns out that Spammers use programs (called robots) to search the Internet for e-mail addresses. This is really easy to do if someone just leaves their e-mail on their website without any protection as in this case from the University of Idaho:
Every member of the faculty and every student is listed here with all their data (including e-mail). If you want your e-mail on a website, use some trick to defeat the robots. Here are some examples:
Change "name@website.com" to "name AT website DOT com"
You might have seen this one before. It's simple because it's still human readable, but most robots can't read it.
Use HTML tricks to hide it
Some ideas I've seen are to replace href=mailto:name@address.com to its equivalent representation in html character codes. It will look very messy in the code (ex. href='mail…), but it will still look like name@address.com when viewed as a webpage.
Use a web form
Use a web form where they enter the subject and content of the message and submit it to a script that mails you. That way, your e-mail address is never exposed. The contact form on this page is an example.
Use an image of an e-mail address
Poetic justice! Just as the Spammers use images to defeat your filters, you can use an image to defeat them! Here's an example:
| name@website.com | -vs- |  |
Notice you can highlight the individual letters of the e-mail on the left, but the right, you can't. This is because the right e-mail address is just an image of an e-mail address, not actual text.
NEVER respond to a Spam e-mail or buy anything from them
If you click a link in a Spam message, you're telling them that Spam is working (and confirming your e-mail address as well). Once again, they can prove to the scum company that's paying them that their ad has been seen.
Worst case scenario, if you actually buy anything as a result of a Spam message, you are supporting the problem. Spam messages need to be fully ignored if they're ever going to die out! Even if you see a product you actually want, find somewhere else online to get it. Chances are that any company that advertises with Spam is bogus or at least terrible anyway.
Note, you may have heard the advice to never click the "Unsubscribe" link in any e-mail. While this is true for true spam, you can safely use the link in any legitimate newsletter or mailing from a company that you created an account with or bought something from. However, when in doubt, just block the e-mail address instead of clicking the link.
