尝试将下拉菜单连接到联系人页面时，我似乎找不到错误。我已经跟踪了我的错误日志，但是我的配置在某个地方被弄乱了，因为我对电子邮件不太熟悉，提前感谢您的建议。

<?php

/***************** Configuration *****************/

// Enter your email, where you want to receive the messages.
$contact_email_to = "EMAIL NAME";

// Subject prefix
$contact_subject_prefix = " ";

// Name too short error text
$contact_error_name = "Name is too short or empty!";

// Email invalid error text
$contact_error_email = "Please enter a valid email!";

// Subject too short error text
$contact_error_subject = "Subject is too short or empty!";

// Message too short error text
$contact_error_message = "Too short message! Please enter something.";


if(!isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {
    // The Request must be Ajax POST, enter a message for direct access requests.
    die('Invalid Request!'); 
}

if( isset($_POST) ) {

    $name = filter_var($_POST["name"], FILTER_SANITIZE_STRING);
    $email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);
    $company = filter_var($_POST["company"], FILTER_SANITIZE_STRING);
    $message = filter_var($_POST["message"], FILTER_SANITIZE_STRING);
    $subject = ($_GET["subject"]);

    if(strlen($name)<4){ 
        die($contact_error_name);
    }

    if(!filter_var($email, FILTER_VALIDATE_EMAIL)){  
        die($contact_error_email);
    }

    if(strlen($company)<3){ 
        die($contact_error_subject);
    }

    if(strlen($message)<3){ 
        die($contact_error_message);
    }

    $sendemail = mail($contact_email_to, $company, $subject, $message,
         "From: ".$name." <".$email.">" . PHP_EOL
        ."Reply-To: ".$email . PHP_EOL
        ."X-Mailer: PHP/" . phpversion()
    );

    if( $sendemail ) {
        echo 'OK';
    } else {
        echo 'Could not send mail! Please check your PHP mail configuration.';
    }
}
?>

<div class="row contact-wrap">
<div class="status alert alert-success" style="display: none"></div>
<div class="col-md-8">
   <div id="sendmessage">Your message has been sent. Thank you!</div>
   <div id="errormessage"></div>
   <form action="" method="post" role="form" class="contactForm">
  <div class="form-group">
     <input type="text" name="name" class="form-control" id="name" placeholder="Your Name" data-rule="minlen:4" data-msg="Please enter at least 4 chars" />
     <div class="validation"></div>
  </div>
  <div class="form-group">
     <input type="email" class="form-control" name="email" id="email" placeholder="Your Email" data-rule="email" data-msg="Please enter a valid email" />
     <div class="validation"></div>
  </div>
  <div class="form-group">
     <input type="text" class="form-control" name="company" id="company" placeholder="Your Company" data-rule="minlen:4" data-msg="Please enter at least 4 chars" />
     <div class="validation"></div>
  </div>
  <div class="form-group">
     <select name="subject" class="form-control" name="subject" id="subject">
        <option value="">---</option>
        <option value="sales">Sales</option>
        <option value="safety">Safety</option>
        <option value="accountsP">Accounts Payable</option>
        <option value="accountsR">Accounts Receivable</option>
        <option value="accountsR">Human Resources</option>
        <option value="accountsR">Operations</option>
        <option value="accountsR">Equipment</option>
        <option value="accountsR">Management</option>
     </select>
  </div>
  <div class="form-group">
     <textarea class="form-control" name="message" rows="5" data-rule="required" data-msg="Please write something for us" placeholder="Message"></textarea>
     <div class="validation"></div>
  </div>
  <div class="text-center"><button type="submit" name="submit" class="btn btn-primary btn-lg" required="required">Submit Message</button></div>
   </form>
</div>