Warning: mail() [function.mail]: "sendmail_from" not set in php.ini or custom "From:" header missing in C:\xampp\htdocs\

Hi I keep getting this error, and I changed the sendmail in the php.ini to:
sendmail_from = 12343OHBS@gmail.com

  $to='12343OHBS@gmail.com';//assigns the email address to the reciever part of the script
 $subject='User Comments OHBS.com';
 $header='test';
 $name=($_POST['Name']);
 $email=($_POST['Email']);
 $Question=($_POST['MessageTitle']);
 // the mail, the .= function is used to add more elements to the message array
 $message="Name: $name\n\n";
 $message.="Email: $email\n\n";
 $message.="Comment or Question: $Question";
 //Wordwrap to limit each line to 100 characters
 $message=wordwrap($message, 100);
 //Script to send the mail
 $mailSent=mail($to,$header,$subject,$message);
 

Please help!

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