通过php发送电子邮件时出现问题

Question

关于PHP，我还是个新手，但我想为我的大学俱乐部创建一种形式。但是，尽管运行正常，但实际上不会发送电子邮件。该代码应检查名称和电子邮件是否有效。然后，如果两者都正确，则代码将继续发送电子邮件。

<?php
print_r($_POST);
// define variables and set to empty values
$name_error = $email_error = "";
$name = $email = $phone = $job = $tools = $range = $smolioli = $exp = $concern = "";

//form is submitted with POST method
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (empty($_POST["name"])) {
    $name_error = "Name is Required!";
  } else {
    $name = test_input($_POST["name"]);
    //check if name only contains letters and spaces
    if (!preg_match("/^[a-zA-Z ]*$/",$name)){
      $name_error = "Only letters and spaces are allowed!";
    }
  }

  if (empty($_POST["email"])) {
    $name_error = "Email is Required!";
  } else {
    $name = test_input($_POST["email"]);
    //check if name only contains letters and spaces
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
      $email_error = "Invalid email =(";
    }
  }

  if ($name_error == "" and $email_error == ""){
    $phone = $_POST['phone'];
    $job = $_POST['job'];

    $powertool = $_POST['powertool'];
    $range = $_POST['range'];
    $smolioli = $_POST['smolioli'];
    $dance = $_POST['dance'];
    $exp = $_POST['exp'];
    $concern = $_POST['concern'];

    $mailTo = "MY EMAIL HERE";
    $headers = "From: Application Page";
    $subject = $name." has sent an application!";
    if($job == "voice"){
      $job = "Singer/Dancer";
      $txt = "Name: ".$name."\nEmail: ".$email."\nJob: ".$job."\nVocal Range: ".$range."\nOkay witha small role: ".$smolioli."\nDancing Ability: ".$dance." out of 10\n\nExperience: ".$exp."\n\nQuestions and or Concerns: ".$concern;
    } elseif ($job == "crew") {
      $job = "Crew"
      $txt = "Name: ".$name."\nEmail: ".$email."\nJob: ".$job."\nPowertool Comfort Lvl: ".$powertool." out of 10\n\nExperience: ".$exp."\n\nQuestions and or Concerns: ".$concern;
    } else {
      $job = "Singer/Dancer or Crew"
      $txt = "Name: ".$name."\nEmail: ".$email."\nJob: ".$job."\nPowertool Comfort Lvl: ".$powertool." out of 10\nVocal Range: ".$range."\nOkay witha small role: ".$smolioli."\nDancing Ability: ".$dance." out of 10\n\nExperience: ".$exp."\n\nQuestions and or Concerns: ".$concern;
    }
    mail($mailTo, $subject, $txt, $headers);
  }

}
function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>