Estoy teniendo problemas para que el correo electrónico se envíe, estoy seguro de que se debe al php, pero aquí también se encuentra el js ajax ... muestra mis mensajes de error para los campos de formulario que no se completan correctamente y luego muestra mi barra de procesamiento una vez. enviado pero recibo mi mensaje de error después del envío ... cualquier ayuda sería apreciada.

html

<form method="post" action="feedback.php" id="contactform">
            <fieldset class="first">


            <div id="response"></div>  


            <div id="name_input">

            <input id="name" name="name" placeholder="Name" class="required" type="text" maxlength="128" />

            </div>



            <div id="email_input">

            <input id="email" name="name" placeholder="Email"  class="required" type="text"  maxlength="128" />

            </div>



            <div id="budget_input">
            <label for="budget">Budget</label>
            <select id="mydropdown">
            <option value="none" selected=“”> -- choose one --</option>
            <option value="firstchoice">$0 - $1,000</option>
            <option value="secondchoice">$1,000 - $2,000</option>
            <option value="thirdchoice">$3,000 +</option>
            </select>
            </div>



            <div id="button">

            <input type="submit" class="button" name="Submit" value="" />
            </div>


            </fieldset>


        </form>

Actualizado:

<?php 

$name = trim(stripslashes(htmlspecialchars($_POST['name'])));           
$email = trim(stripslashes(htmlspecialchars($_POST['email'])));
$mydropdown = trim(stripslashes(htmlspecialchars($_POST['mydropdown'])));  
$recipient = "[email protected]";  
$humancheck = $_POST['humancheck'];
$honeypot = $_POST['honeypot'];



    if ($honeypot == 'http://' && empty($humancheck)) { 

    //Validate data and return success or error message
    $error_message = '';    
    $reg_exp = "/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9-]+\.[a-zA-Z.]{2,4}$/";

    if (!preg_match($reg_exp, $email)) {

                $error_message .= "<p>A valid email address is required.</p>";             
    }
    if (empty($name)) {

                $error_message .= "<p>Please provide your name.</p>";              
    }

    if (empty($mydropdown)) {

                $error_message .= "<p>Please select an item from the list.</p>";
    }               

    if (!empty($error_message)) {
                $return['error'] = true;
                $return['msg'] = "<h3>Oops! The request was successful but your form is not filled out correctly.</h3>".$error_message;                 
                echo json_encode($return);
                exit();
        } else {

        //send to  an email


        $emailSubject = 'Top Contact Form';
        $webMaster = '[email protected]';

 $body="
 <br><hr><br>
 <strong>Name:</stong> $name <br>
 <br>
 <strong>Email:</stong> $email <br>
 <br>
 <strong>Budget:</strong> $mydropdown <br>
 <br>
 ";      

        $headers = "From: $email\r\n";
        $headers .= "Content-type: text/html\r\n";


        //send email and return to user
        if(mail($webMaster, $emailSubject, $body, $headers)) {

            $return['error'] = false;
            $return['msg'] = "<p>Message sent successfully. Thank you for your interest " .$name .".</p>"; 
            echo json_encode($return);
        }
    }   
 } else {

$return['error'] = true;
$return['msg'] = "<h3>Oops! There was a problem with your submission. Please try again.</h3>";  
echo json_encode($return);
 }

?> 



$(document).ready(function() {

$('form #response').hide();

$('#submit').click(function(e) {

    // prevent forms default action until
    // error check has been performed
    e.preventDefault();

    // grab form field values
    var valid = '';
    var required = ' is required.';
    var name = $('form #name').val();
    var email = $('form #email').val();
    var mydropdown = $('form #mydropdown').val();
    var honeypot = $('form #honeypot').val();
    var humancheck = $('form #humancheck').val();


    // perform error checking
    if (name == '' || name.length <= 2) {
        valid = '<p>Your name' + required +'</p>';  
    }

    if (!email.match(/^([a-z0-9._-]+@[a-z0-9._-]+\.[a-z]{2,4}$)/i)) {
        valid += '<p>Your email' + required +'</p>';                                                  
    }

    if (mydropdown == '') {
        valid += '<p>An item from the list' + required +'</p>';

    }

    if (honeypot != 'http://') {
        valid += '<p>Spambots are not allowed.</p>';    
    }

    if (humancheck != '') {
        valid += '<p>A human user' + required + '</p>'; 
    }


    // let the user know if there are erros with the form
    if (valid != '') {

        $('form #response').removeClass().addClass('error')
            .html('<strong>Please correct the errors below.</strong>' +valid).fadeIn('fast');           
    }
    // let the user know something is happening behind the scenes
    // serialize the form data and send to our ajax function
    else {

        $('form #response').removeClass().addClass('processing').html('Processing...').fadeIn('slow');                                      

        var formData = $('form').serialize();
        submitForm(formData);           
    }           

});
});


function submitForm(formData) {

$.ajax({    
    type: 'POST',
    url: 'send.php',        
    data: formData,
    dataType: 'json',
    cache: false,
    timeout: 12000,
    success: function(data) {           

        $('form #response').removeClass().addClass((data.error === true) ? 'error' : 'success')
                    .html(data.msg).fadeIn('fast'); 

        if ($('form #response').hasClass('success')) {

            setTimeout("$('form #response').fadeOut('fast')", 12000);
        }

    },
    error: function(XMLHttpRequest, textStatus, errorThrown) {

        $('form #response').removeClass().addClass('error')
                    .html('<p>There was an<strong> ' + errorThrown +
                          '</strong> error due to a<strong> ' + textStatus +
                          '</strong> condition.</p>').fadeIn('fast');           
    },              
    complete: function(XMLHttpRequest, status) {            

        $('form')[0].reset();
    }
}); 
};