WordPress Plugin: Contact form 7
Contact form 7 is a very flexible plugin which can be used to manage multiple contact forms.You can customize the form with ultimate features!. Contact form 7 not only supports CAPTCHA but it has power of submitting Ajax..It has a brilliant feature for controlling spam’s.It can be translated into 37 famous languages of the world!
The control panel of contact form 7 allow you to manage everything in well organized manner..It is compatible up to wordpress 2.7.1
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Problem using this plugin feel free to ask via comment 
