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Last Updated: Sep 2009
Last Updated: Sep 2009
3) Server-side email spam filters. Many ISPs and email servers (HotMail, Yahoo! Mail, etc.) have installed email filtering software that scans email for certain triggers, which may include certain phrases, formatting, and aggressive writing styles. However, many unfair marketers have learned to fool spam filters, while a lot of legitimate emails are blocked by them.
Mail filters have varying degrees of configurability. Sometimes they make decisions based on matching a regular expression. Other times, keywords in the message body are used, or perhaps the e-mail address of the sender of the message. Some more advanced filters, particularly anti-spam filters, use statistical document classification techniques such as the naive Bayes classifier. Image filtering can also be used that use complex image analysis algorithms to detect skin-tones and specific body shapes normally associated with adult-images (pornographic images).
Mail filters have varying degrees of configurability. Sometimes they make decisions based on matching a regular expression. Other times, keywords in the message body are used, or perhaps the e-mail address of the sender of the message. Some more advanced filters, particularly anti-spam filters, use statistical document classification techniques such as the naive Bayes classifier. Image filtering can also be used that use complex image analysis algorithms to detect skin-tones and specific body shapes normally associated with adult-images (pornographic images).
Email spam has reached epidemic levels. Many active Internet users and online business owners receive hundreds of junk emails each day and have to spend hours trying to dig out the "real" emails. So it's no wonder that programmers have created a lot of paid and free spam blockers.
There are three basic types of traditional antispam software...
1) Plug-ins for email clients. These antispam programs run on your computer and require all received spam to be downloaded before they start sorting it.
2) Standalone applications. These spam blockers also run on your computer and communicate with the email server multiple times each hour to check your POP mailbox for spam and delete it. They constantly run in the background, using up resources and bandwidth.
There are three basic types of traditional antispam software...
1) Plug-ins for email clients. These antispam programs run on your computer and require all received spam to be downloaded before they start sorting it.
2) Standalone applications. These spam blockers also run on your computer and communicate with the email server multiple times each hour to check your POP mailbox for spam and delete it. They constantly run in the background, using up resources and bandwidth.
