Spamming and Spam-Blocker

Spamming is one in every of the large headaches to the net masters. Spammers abuse their electronic messaging system; post messages on blog, forum or guest book, or send spam emails to urge free advertisement. This issue becomes a lot of serious once they use automated spam program or robot for spamming. Thus in all trendy scripts available these days have inbuilt spam-blocker system. Below, I shall discuss some commonly adopted anti spam system used by the net masters in blocking spam.
Captcha image verification spam-blocker
Captcha image verification technique is the foremost common method to dam spamming. In this technique a picture of text string is displayed over the form to be submitted. Users trying to submit messages should type that image verification text on a textbox to pass through that process. Persons will simply browse that text from its image except for an automatic spam program it is almost impossible to extract text unless it uses smart quality OCR (optical character reader) software. With deliberate addition of some noise and distortion over the Captcha image makes it even harder to read. Benefits of Captcha image verification are,
?    Solely the GD library support required to come up with Captcha image.
?    When designed rigorously this technique provides a high degree of protection to the spammers while loading minimum burden over the users.
The disadvantages are,
?    In some poorly designed system noise and distortion are thus heavily added it becomes really tough to read the text from image. Confusion arises between tiny and capital letters, between the letter 'o' and the digit 'zero'.
?    Visually handicraft persons can't experience this method.

Query answer technique spam-blocker
In this technique a random however simple query is displayed over the form; user should sort the proper answer to submit to this process. Example of such questions are, "fire is hot or cold", "type color of blood", "add nine with seven", etc. The benefits of this technique of spam blocking are,
?    This technique is very much user friendly;
?    It does not require any special software support to generate.
The disadvantage is that it provides terribly low degree of protection against spamming compare to Captcha image verification method.
Email and IP ban method spam filter
You can't stop spam by banning few email or IP addresses. This method solely gives you some further level of security. Few webmasters ban a cluster of IPs from where most spam messages are coming. In such sites if you try to register to post your comments you first expertise a ban notice over your IP and request a message to contact to the webmaster to beat that problem. So this spam filter method filter out the spammers and the great users as well.
Whatever the strategy used the ultimate goal of all such strategies is to produce high degree of protection to the robots while not harassing the overall users. So when you are selecting a spam protection system careful regarding the following points.
?    System should be browser independent.
?    Do not load too much on your viewers to pass through the system.
?    System ought to provide maximum security against robot. To stop trial and error technique every time user submit message, refreshes your security question  or security image.

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James Brunner been writing articles online for nearly 2 years now. Not only does this author specialize in spam blocker ,you can also check out his latest website about: Coleman Hot Tubs Which reviews and lists the best

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