Regarding Contact form 7

I am using contact form 7. Its an excellent plugin by you guys. Thanks a lot for that. I am facing one problem..

I am sending mail to given email id.. Mail sent successfully. But after sending i am rediect to another url and the url is related to paypal page. But while redirect to page it display Cookies are blocked. Please let me know how can i solve this problem. I am trying to solve for last 2 days……..

Please reply as soon as possible. Its urgent.