Contact Form 7 error

Hello,
I want to know where exactly have I got to modify the code as per kinow’s example?
Also, under Tools >> Contact Form 7, what have I got to do in the “Mail” section? As I am new to WordPress, I have very little idea of what to do edit or what not to edit in plugins.

The slight correction to the code that kinow posted works for yahoo hosting note the difference between the comment and the actually code.
The comment is the original code for those not sure what the comment is that would be the part in bold with “//”
}
//return @wp_mail($mail_recipient, $mail_subject, $mail_body, $mail_headers, $for_this_mail);
return @wp_mail($mail_recipient, $mail_subject, $mail_body);
} else {
//return @wp_mail($mail_recipient, $mail_subject, $mail_body, $mail_headers);
return @wp_mail($mail_recipient, $mail_subject, $mail_body);
}
:::::::::::

I’m running into the same error. I cannot seem to get any of my forms to work. Upon clicking send, I receive “Failed to send your message. Please try later or contact administrator by other way.” in a red bound box.
What file are you editing with the above code. I looked in wp-contact-form-7.php to give it a try but couldn’t find the code you were referencing.