![]() ![]() As long as it’s contained in the image, the text of the spam message can be as obvious as the spammer wants it to be. Most email clients will display the image, but anti-spam filters will treat the image as an opaque block of binary data. As an alternative, they craft messages that consist solely of an image file. Some spammers don’t want to deal with the hassle of setting up a deliberately confusing system of web sites and redirects to sneak their message past spam filters. Many corporations, academic institutions, and ISPs aren’t going to be willing to purchase the additional email servers required to keep email flowing smoothly. The problem with this is that it significantly slows down the flow of email. Based on the contents of the website, the filter could determine if the message was spam. The only way to reliably identify this sort of message as spam is for an anti-spam filter to actually visit the website whose URL appears in the message. But the spammers have increased their level of sophistication, and now they use numerous redirects and domain aliases to disguise the true identity of the systems hosting their sites. Spam filters could simply block messages that contained a URL referencing one of these systems. When spammers started using this trick, they would host their sites on a relatively small number of systems. If an email user clicks on the URL, they are taken to a web page where the spammer makes his product pitch.īecause the message only contains a small amount of generic text and a URL, there’s virtually nothing a spam filter can use to determine if the message is spam or not. These spammers send messages that contain only a brief, generic sentence and a URL. ![]() Some spammers have discovered that the best way to hide message text from spam filters is to avoid putting any text at all in the message. The images don’t even have to really exist - they’re so small that the email client’s “broken image” replacement won’t be visible. To a spam filter that doesn’t understand the meaning of the tags.Ī variation of this trick is to use very small (one pixel wide) images to break up words. For example, the HTML:įr>!- 63 -!- adf -!- sdf -!- e - tags to make them so small they’re unnoticeable to users reading the message. The spammers are greatly aided by the widespread support of HTML in most email client software.Ī trick in very common usage is to break up “interesting” words with HTML comments. Spammers have developed several creative techniques to hide text so a human can find it, but spam filters cannot. If the spam filter can’t find the offending text, it can’t use it to determine if the message is spam or not. One of the most obvious ways to sneak a spam message past a filter is to “hide” the part of the message that makes it spam. Anti-spam filters that make use of multiple techniques will correctly filter messages that use most of these tricks. The majority of these tricks only work on one spam filtering technique. This whitepaper examines some of the most common tricks employed by spammers to sneak messages through today’s spam filtering solutions. Watch this short demo to see how you can create a portfolio site with .As spam filters evolve to become better and better at identifying and discarding spam, they force the spammers to develop new tricks to circumvent the filters. I gave it a try on Friday afternoon and in ten minutes I created a little photography portfolio site that looks way better than anything I could have created with Google Sites or WordPress. ![]() Ĭ is a new easy-to-use tool to quickly create good-looking, simple websites. Fortunately, there are some good tools students can use to quickly create simple, good-looking websites to showcase their work and share a bit about themselves. Services like WordPress and Weebly are great, but have way more menus and options than what’s needed for a quick and simple site. Google Sites is fine for making simple sites, but the aesthetics still have a long way to go. The purpose of these kinds of sites is to share photography, their resumes, videos they’ve made, or awards and references they’ve received. Tools like Seesaw and Spaces are good for that. ![]() The purpose isn’t to share everything they’ve done and have you grade it. I often get asked for recommendations for simple website builders that teachers and students can use to create small websites. ![]()
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