Spamming and Spam-Blocker

Spamming and Spam-Blocker

Spamming and Spam-Blocker

Captcha image verification spam-blockerCaptcha image verification method is the foremost in style methodology to dam spamming. During this methodology an image of text string is displayed over the form to be submitted. Users trying to submit messages must kind that image verification text on a textbox to withstand that process. Folks can simply scan that text from its image except for an automatic spam program it is virtually impossible to extract text unless it uses good quality OCR (optical character reader) software. With deliberate addition of some noise and distortion over the Captcha image makes it even tougher to read. Advantages of Captcha image verification are," Solely the GD library support needed to get Captcha image." When designed rigorously this method 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 difficult to scan the text from image. Confusion arises between little and capital letters, between the letter 'o' and therefore the digit '0'." Visually handicraft persons cannot go through this method.

Query answer methodology spam-blockerDuring this method a random but straightforward question is displayed over the form; user must kind the proper answer to withstand this process. Example of such queries are, "hearth is hot or cold", "sort color of blood", "add 9 with seven", etc. The benefits of this technique of spam blocking are," This technique is terribly much user friendly;" It does not need any special software support to generate.The disadvantage is that it provides very low degree of protection against spamming compare to Captcha image verification method.Email and IP ban methodology spam filterYou can't stop spam by banning few email or IP addresses. This methodology solely provides you some extra level of security. Few webmasters ban a group of IPs from where most spam messages are coming. In such sites if you try to register to post your comments you initially expertise a ban notice over your IP and request a message to contact to the webmaster to beat that problem. Therefore this spam filter method filter out the spammers and the great users as well.No matter the strategy used the ultimate goal of all such strategies is to produce high degree of protection to the robots without harassing the overall users. So when you're choosing a spam protection system careful concerning the following points." System should be browser independent." Don't load an excessive amount of on your viewers to experience the system." System should provide maximum security against robot. To prevent trial and error method each time user submit message, refreshes your security question or security image.

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