这个表单提示“发送失败”

将形式action="$_SELF"更改为action="$_SERVER['PHP_SELF']"，因为没有$_SELF那样的常量

实际上它在这里工作，没有错误试试这个小脚本，检查是否允许电子邮件:

<?php
$to = "somebody@example.com";
$subject = "My subject";
$txt = "Hello world!";
$headers = "From: webmaster@example.com" . "'r'n" .
"CC: somebodyelse@example.com";
mail($to,$subject,$txt,$headers);
?>

我已经测试了你的脚本与小调整:

<form id="contactform" method="post" action="#">
        <label class="hide" for="author">Full Name</label> 
        <input class="input-fields" id="author" name="name" type="text" placeholder="Full Name" value="aaa" required autofocus />
        <label class="hide" for="email">Email</label> 
        <input class="input-fields" id="email" name="email" type="text" placeholder="Email Address" value="xxx@boboba.com" autofocus />
        <label class="hide" for="email">Mobile No</label> 
        <input class="input-fields" id="email" name="phone_no" type="text" placeholder="Mobile No" value="0322233355" autofocus />
        <label class="hide" for="author">Company</label> 
        <input class="input-fields" id="author" name="company" type="text" placeholder="Company" value="aaa" required autofocus />
        <label class="hide" for="select_category">Select a Industry:</label> 
        <span id="select_group" class="select-group">
            <select name="vehicle">
                <option value="General" >Select a Industry:</option>
                <option value="General" >Health Centres Hospitals</option>
                <option value="Sales" >Tradeshows Conferences</option>
                <option value="Support" >Fast Foods and Restaurants</option>
                <option value="Support" >Night CLub, Bars and Disos</option>
                <option value="Support" >Banks , Rent Estate</option>
                <option value="Support" >Educational Institute</option>
                <option value="Support" >Recreational Facilities</option>
                <option value="Support" >Malls,Luxury Retail and Store Windows</option>
            </select>
        </span>
        <label class="hide" for="subject_title">Solutions</label> 
        <input class="input-fields" id="subject_title" name="solution" type="text" placeholder="Solutions" value="aaa" autofocus />
        <label class="hide" for="author">Require</label> 
        <input class="input-fields" id="author" name="require" type="text" placeholder="Require" value="aaa" required autofocus />
        <label class="hide" for="comment">Message</label> 
        <textarea id="comment" class="input-fields" placeholder="Message" name="message" cols="40" rows="20"></textarea>
        <span class="form_response">
                                           <ul id="errors" class="">
                                                    <li id="info">There were some problems with your form submission:</li>
                                           </ul>
                                                <p id="success" class="">Thanks for your message! We will get back to you ASAP!</p>
                                    </span>
        <input name="submit" type="submit" id="submit-contact-info" class="contact-info-submit form-submit-button span2" value="Send message">
                </form>
                          </div>
                </div>
            </article>
        </main>
  </div>

 <?php
         //If the form is submitted
           if(isset($_REQUEST['submit'])) 
           {
             $message = $_POST['message'];
           }                                     
                   //Check to make sure that the exit date field is not empty
             if(trim($_POST['vehicle']) == '') {
               $hasError = "1";
             } else {
               $vehicle = trim($_POST['vehicle']);
             }
         //Check to make sure that the exit date field is not empty
             if(trim($_POST['require']) == '') {
               $hasError = "2";
             } else {
               $require = trim($_POST['require']);
             }
         //Check to make sure that the exit date field is not empty
             if(trim($_POST['solution']) == '') {
               $hasError = "3";
             } else {
               $solution = trim($_POST['solution']);
             }
           //Check to make sure that the name field is not empty
             if(trim($_POST['name']) == '') {
               $hasError = "4";
             } else {
               $name = trim($_POST['name']);
             }
           //Check to make sure sure that a valid email address is submitted
             if(trim($_POST['email']) == '')  {
               $hasError = "5";
             } else if (!eregi("^[A-Z0-9._%-]+@[A-Z0-9._%-]+'.[A-Z]{2,4}$", trim($_POST['email']))) {
               $hasError = "6";
             } else {
               $email = trim($_POST['email']);
             }
           //Check to make sure that the mobile no field is not empty
             if(trim($_POST['phone_no']) == '') {
               $hasError = "7";
             } else {
               $phone_no = trim($_POST['phone_no']);
             }
             //If there is no error, send the email
    if(!isset($hasError)) 
      {
      echo "OK";
               $emailTo = "sahil7771@gmail.com"; //Put your own email address here
               $body = "Name: $name 'n'nEmail: $email 'n'nMobile No: $phone_no 'n'n Your Industry: $vehicle 'n'
              'n'n Your Requirement: $require 'n'n Your Solution: $solution 'n'n 
              'n'n Message : $message 
              'n'nPlease Contact $name  on $phone_no'n 'n /====================================/ ";
               $headers = 'From: Touch Active  <'. $emailTo .'>' . "'r'n" . 'Reply-To: ' . $email; 

                                              if(mail($emailTo, 'Mail From Touch Active', $body, $headers))
                                              { //Replace Your Website Subject
                                                $response=1;
                                                $emailSent = true; 

                                              ?> 
               <div id="responsive-container" ><p>Thanks For Messaging Us You Will Shortly Expect Our Assistance ( With In 24hrs ).</p></div>
               <?php
               }
                else
               {
                 ?>
                 <div id="page-title"><h2>Failed To Sent</h2></div>
                 <?php echo "NOK";
                 echo $hasError;
                 echo $response;
                 $response=0;
               }
         }
         else{
         echo $hasError;
         }
   ?>