PHP电子邮件验证和从HTML表单检索

我一直在尝试创建一个表单来收集用户名、电子邮件和问题，但我对PHP太陌生了，所以我一直在努力使用它

目标是收集信息，当他们按submit时，他们的电子邮件地址应该被发送到我的电子邮件中，我希望它被验证为真实的电子邮件地址

HTML代码：

 <form method="post" action="process.php">
<fieldset>
<legend>Personal Information</legend>


<p><label for="name">Name:</label>
<input type="text" name="name" id="name" maxlength="50" autofocus required /></p>

<p><label for="recipient">Email Address:</label>
<input id="recipient" name="recipient" type="text" name="recipient" required></p>


</fieldset>

<fieldset>
<legend>Tours Interested In:</legend>

<p><label for="question">Questions/Comments:</label>
<textarea id="question" name="question" cols="50" rows="3"     placeholder="type your comments here" required></textarea>
</fieldset>

<p class="centralize"><input type="submit" onclick="send()"     value="Submit Only" /></p>
<p class="centralize"><input type="reset" value="Clear Form"></p>

<p id="data_return"></p>


</form>

个人信息
姓名：

电邮地址：

感兴趣的旅游：
问题/评论：

PHP代码：

<?php
header("Content-type: text/html");

$name=$_POST["name"];
$question=$_POST["question"];
$email =$_POST["email"];

$subject = "You have a USER INQUIRY:";
$to = 'myemail@myemail.com';


if(!$_POST['name']){
$errName = 'Please enter your name';
}






 echo "<p>Thank you, $name . Your Email has been Sent, and we will get     back to you within 48 hours.</p>";

 //Build email (to myself)


 mail($to, $name, $subject, $question, $email);

检查mail（）函数在php中的工作方式。
并检查下面的代码。祝你好运：）

检查mail（）函数在php中的工作方式。
并检查下面的代码。祝你好运：）

查看mail函数在手册中接受的参数查看mail函数在手册中接受的参数
<?php
header("Content-type: text/html");
if(isset($_POST['submit'])){ //check if the submit button actually clicked
  $name=$_POST["name"];
  $question=$_POST["question"];
  $email = test_input($_POST["recipient"]);
  if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {  //php validations http://www.w3schools.com/php/php_form_url_email.asp
    echo "Invalid email format";
  }

  $subject = "You have a USER INQUIRY:";
  $to = 'myemail@myemail.com';
  $message = "Name: {$name} \n";
  $message .= "Email: {$email} \n"; 
  $message .= "Question: {$question} \n";


  if(!$_POST['name']){
    $errName = 'Please enter your name';
  }

   echo "<p>Thank you," . $name . "Your Email has been Sent, and we will get     back to you within 48 hours.</p>";

   //Build email (to myself)

   mail($to, $subject, $message);
}

<input id="recipient" name="recipient" type="email" required></p>