The impact of spam on Internet uses varies, but nobody escapes untouched, that's for sure. An active Internet surfer or a business that works online a lot, receives hundreds if not thousands of messages that are hard to separate into legitimate mails and spam. Software companies provide us with the most efficient solution in the form of paid or free spam blockers.

Anti-spam tools can be classified in three different categories, depending on how they operate. A first group of spam blockers is that of the plug-ins. Such programs get installed on the computer and perform the complete download of the spam before sorting and eliminating it. Such an anti-spam solution may not be the best all the time.

Stand-alone applications are another category of spam blockers. Such software runs on the computer that requires constant communication with the email server. At regular intervals, the tool checks the inbox for spam, identifying the potential threats. Such spam blockers consume resources and bandwidth.

Spam filters of the server side type make a third variant of spam blockers that are usually installed by major email servers such as Yahoo! Mail or MSN. Starting from potentially aggressive phrases, keywords or writing styles, the incorporated software detects the unwanted emails. There are many ways to fool spam filters, and dishonest Internet users know how to manipulate their tools to do so.

Spam blockers could be a problem for Internet marketers that use opt-in listings to advertise their products and services. Lots of newsletters don't get read because the spam filters or spam blockers treat them like unsolicited mail. Many marketers have found ways to adapt to this situation, managing to pass filters by changing the email content.

Although, we'd like to believe we have full protection against unsolicited mail, spam blockers have a 90% efficiency most of the time. There are even very advanced anti-spam systems that can delete 99% of spam. When shopping for an anti-spam tool, check those spam blockers that are compatible with your computer and email service. Also make sure that you won't have difficulties of installation, and find out how high the level of blockage is. The cost is also an issue as the most effective tools are the priciest on the market.

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