mail is not sending in php, giving Unexpected token W -

i'm sending mail using mail() function,but mail not going,this giving "unexpected token w" error..what problem,here code: 1 me solve issue....i'm sending mail using mail() function,but mail not going,this giving "unexpected token w" error..what problem,here code:...i'm sending mail using mail() function,but mail not going,this giving "unexpected token w" error..what problem,here code: 1 me solve issue....

index.php:  <form name="" action="contact.php" method="post" class="wpcf7-form" novalidate>                           <div style="display: none;">                             <input type="hidden" name="_wpcf7" value="5" />                             <input type="hidden" name="_wpcf7_version" value="4.1" />                             <input type="hidden" name="_wpcf7_locale" value="en_us" />                             <input type="hidden" name="_wpcf7_unit_tag" value="wpcf7-f5-p12-o1" />                             <input type="hidden" name="_wpnonce" value="aa14dbded6" />                           </div>                           <div class="wpcf7-response-output wpcf7-display-none"></div>                           <div class="row">                             <div class="col-sm-6">                               <div class="form-field">                                 <label for="your-name">your name <span>*</span></label>                                 <span class="wpcf7-form-control-wrap your-name">                                 <input type="text" name="name" value="" size="40" class="wpcf7-form-control wpcf7-text wpcf7-validates-as-required" id="your-name" aria-required="true" aria-invalid="false" />                                 </span> </div>                               <div class="form-field">                                 <label for="your-email">your email <span>*</span></label>                                 <span class="wpcf7-form-control-wrap your-email">                                 <input type="email" name="email" value="" size="40" class="wpcf7-form-control wpcf7-text wpcf7-email wpcf7-validates-as-required wpcf7-validates-as-email" id="your-email" aria-required="true" aria-invalid="false" />                                 </span> </div>                               <div class="form-field">                                 <label for="your-phone">your phone</label>                                 <span class="wpcf7-form-control-wrap your-phone">                                 <input type="tel" name="phone" value="" size="40" class="wpcf7-form-control wpcf7-text wpcf7-tel wpcf7-validates-as-tel" id="your-phone" aria-invalid="false" />                                 </span> </div>                             </div>                             <div class="col-sm-6">                               <div class="form-field">                                 <label for="your-subject">subject</label>                                 <span class="wpcf7-form-control-wrap your-subject">                                 <input type="text" name="subject" value="" size="40" class="wpcf7-form-control wpcf7-text" id="your-subject" aria-invalid="false" />                                 </span> </div>                               <div class="form-field">                                 <label for="your-message">message <span>*</span></label>                                 <span class="wpcf7-form-control-wrap your-message">                                 <textarea name="message" cols="40" rows="10" class="wpcf7-form-control wpcf7-textarea wpcf7-validates-as-required" id="your-message" aria-required="true" aria-invalid="false"></textarea>                                 </span> </div>                               <div class="form-field">                                 <input type="submit" value="send message" name="submit" class="wpcf7-form-control wpcf7-submit c-button" />                               </div>                             </div>                           </div>                         </form>  contact.php: <?php   $to = "arundsti@gmail.com";  $subject = 'a new enquiry on diamondshine';  $name = $_request['name'];  $email = $_request['email'];  $phone = $_request['phone'];  $subject=$_request['subject'];  $date = date("y/m/d");  $comments = $_request['message'];   if(isset($_post['submit'])) {    $message = '<img src=\imagedental\'><br><br><br><b>name</b>: '  .$name.'<br><br><b>email</b>: '  .$email.'<br><br><b>phone</b>: '  .$subject.'<br><br><b>subject</b>: '  .$phone.'<br><br><b>messsage</b>: '  .$comments.'<br><br><b>date</b>: '.$date;  // send html mail, content-type header must set $headers  = 'mime-version: 1.0' . "\r\n"; $headers .= 'content-type: text/html; charset=iso-8859-1' . "\r\n";  // additional headers //$headers .= 'to: mary <mary@example.com>, kelly <kelly@example.com>' . "\r\n"; $headers .= 'from: diamondshine '.$email . "\r\n"; //$headers .= 'cc: birthdayarchive@example.com' . "\r\n"; //$headers .= 'bcc: birthdaycheck@example.com' . "\r\n";  $sent = mail($to, $subject, $message, $headers) ;  if($sent)  {  ?> <script type="text/javascript"> alert('thanks contacting us. in touch shortly...'); location.href = "contactus.php"; </script> <?php  }  else  {print "we encountered error sending mail"; } }  ?> 

your code working fine confirm whether have configured sendmail on server