Spamming and Spam-Blocker
Spamming is one amongst the big headaches to the web masters. Spammers abuse their electronic messaging system; post messages on blog, forum or guest book, or send spam emails to get free advertisement. This issue becomes additional serious after they use automated spam program or robot for spamming. Thus in all trendy scripts out there nowadays have inbuilt spam-blocker system. Below, I shall discuss some commonly adopted anti spam system utilized by the web masters in blocking spam.
Captcha image verification spam-blocker
Captcha image verification technique is the foremost standard methodology to block spamming. During this method a picture of text string is displayed over the shape to be submitted. Users attempting to submit messages have to sort that image verification text on a textbox to meet up with that process. Kith and kin can simply browse that text from its image except for an automatic spam program it's virtually 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 more durable to read. Benefits of Captcha image verification are,
" Solely the GD library support needed to generate Captcha image.
" When designed rigorously this methodology 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 extremely tough to read the text from image. Confusion arises between little and capital letters, between the letter 'o' and also the digit '0'.
" Visually handicraft persons cannot tolerate this method.
Query answer method spam-blocker
During this methodology a random however easy query is displayed over the form; user must kind the right answer to suffer this process. Example of such queries are, "fire is hot or cold", "sort color of blood", "add nine with seven", etc. The benefits of this technique of spam blocking are,
" This method is very abundant 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 methodology spam filter
You cannot forestall spam by banning few email or IP addresses. This methodology only 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 are attempting 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 overcome that problem. Therefore this spam filter methodology filter out the spammers and the great users as well.
No matter the tactic used the final goal of all such ways is to produce high degree of protection to the robots without harassing the overall users. Thus when you're selecting a spam protection system careful about the subsequent points.
" System must be browser independent.
" Do not load an excessive amount of on your viewers to withstand the system.
" System ought to offer most security against robot. To prevent trial and error method every time user submit message, refreshes your security query or security image.
Author Resource:
Celestine Hayes has been writing articles online for nearly 2 years now. Not only does this author specialize in Spam Blocker, you can also check out latest website about
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