PHP郵件腳本，電子郵件未發送

我試圖通過簡單的PHP郵件腳本發送郵件。我已經多次檢查代碼，該頁面將轉到「Thankyou_page」，好像應該發送郵件一樣，但我還沒有收到電子郵件。任何想法爲什麼這不起作用？PHP郵件腳本，電子郵件未發送

<?php 
/* 
This first bit sets the email address that you want the form to be submitted to. 
You will need to change this value to a valid email address that you can access. 
*/ 
$webmaster_email = "[email protected]"; 
$subject = "Contact Us"; 

/* 
This bit sets the URLs of the supporting pages. 
If you change the names of any of the pages, you will need to change the values here. 
*/ 
$feedback_page = "feedback_form.html"; 
$error_page = "error_message.html"; 
$thankyou_page = "thank_you.html"; 

/* 
This next bit loads the form field data into variables. 
If you add a form field, you will need to add it here. 
*/ 
$email_address = $_REQUEST['email_address'] ; 
$comments = $_REQUEST['comments'] ; 

/* 
The following function checks for email injection. 
Specifically, it checks for carriage returns - typically used by spammers to inject a CC list. 
*/ 
function isInjected($str) { 
    $injections = array('(\n+)', 
    '(\r+)', 
    '(\t+)', 
    '(%0A+)', 
    '(%0D+)', 
    '(%08+)', 
    '(%09+)' 
    ); 
    $inject = join('|', $injections); 
    $inject = "/$inject/i"; 
    if(preg_match($inject,$str)) { 
     return true; 
    } 
    else { 
     return false; 
    } 
} 

// If the user tries to access this script directly, redirect them to the feedback form, 
if (!isset($_REQUEST['email_address'])) { 
header("Location: $feedback_page"); 
} 

// If the form fields are empty, redirect to the error page. 
elseif (empty($email_address) || empty($comments)){ 
header("Location: $error_page"); 
} 

// If email injection is detected, redirect to the error page. 
elseif (isInjected($email_address)) { 
header("Location: $error_page"); 
} 

// If we passed all previous tests, send the email then redirect to the thank you page. 
else { 
mail($webmaster_email, $subject, 
    $comments, "From: " . $email_address); 
header("Location: $thankyou_page"); 
} 
?>

來源

2012-09-19 Emily Bichler

你能打印出電子郵件地址以確保地址正確嗎？如果郵件函數成功則返回true，否則返回false。你應該打印它或使用if（mail（...））header ... else header（... error_page） – ajon

你檢查了你的服務器日誌嗎？郵件可能被標記爲垃圾郵件嗎？ – j08691

您的電子郵件標題可能是錯誤/格式錯誤。在這種情況下，收件人郵件服務器會拒絕您的郵件，即使郵件功能成功發送，您也不會收到郵件。 –