note 98714 added to function.mail

Hello i am new to PHP my query is related to mail() when i send the mail i got an error Warning: mail() [function.mail]: "sendmail_from" not set in php.ini or custom "From:" header missing in C:\xampp\htdocs\EmailApplication\InformationSend.php on line 14 my code is <html> <body> <?php $name = $_POST['firstName']." ".$_POST['lastName']; $email = $_POST['email']; $ask = $_POST['ask']; $to="moyalvivek@yahoo.co.in"; $sub="Testing"; $from="vivekmoyal28@gmail.com"; $headers = "From: vivekmoyal28@gmail.com; ?> <?php mail($to,$sub,$ask,$headers); echo "Mail Sent"; ?> <?php echo "My name is : ".$name .'<br/>'; echo "My email is : ".$email. '<br/>'; echo "Ask me : ".$ask; ?> </body> </html> please tell me where is the error and how to set header in php.ini ---- Server IP: 69.147.83.197 Probable Submitter: 59.95.189.102 ---- Manual Page -- http://www.php.net/manual/en/function.mail.php Edit -- https://master.php.net/note/edit/98714 Del: integrated -- https://master.php.net/note/delete/98714/integrated Del: useless -- https://master.php.net/note/delete/98714/useless Del: bad code -- https://master.php.net/note/delete/98714/bad+code Del: spam -- https://master.php.net/note/delete/98714/spam Del: non-english -- https://master.php.net/note/delete/98714/non-english Del: in docs -- https://master.php.net/note/delete/98714/in+docs Del: other reasons-- https://master.php.net/note/delete/98714 Reject -- https://master.php.net/note/reject/98714 Search -- https://master.php.net/manage/user-notes.php