PHP - 附加文本文件 - 邮件不工作

Question

我正在编写一个应用程序，用于发送包含CSV作为附件的电子邮件。但是，它不起作用。 mail函数不返回false（暗示它成功）;但是，电子邮件没有发送。

之前我已经从服务器发送/接收过电子邮件，所以我不相信这是问题所在。但是，我没有任何通过PHP发送附件的经验，所以我怀疑问题就在那里。我在一定程度上遵循了本教程：http://www.texelate.co.uk/blog/post/56-send-an-email-attachment-with-php/

以下是一些代码段：

$file = tmpfile();

// code omitted

$fileArray = array(); // this gets filled with more arrays/lines of data


// code omitted


try {

foreach($fileArray as $line) {
var_dump($line);
fputcsv($file, $line);
}

// begin mailing
$toEmail = 'myemail';
$subject = "Insurance Registration";

fseek($file, 0);
$attachData = fread($file, 1024);
$fileName = $lastName . "_" . date('Y');
$random = md5(time());
$boundary =  "==Multipart_Boundary_x{$random}x";
$headers = "From: Test \nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed\n" . "boundary=\"{$boundary}\"";
$message = "Testing!.\n\n " . "-{$boundary}\n " . "Content-Type= text/plain; charset=\"iso-8859-1\n" . "Content-Transfer-Encoding 7bit\n\n " . "Testing Again " . "\n\n ";
$attachData = chunk_split(base64_encode($attachData));
$message .= "--{$boundary}\n" . "Content-Type: text/plain;\n" . "name=\"{$fileName}\"\n" . "Content-Disposition: attachment;\n" . " filename=\"{$fileName}\"\n" . " . Content-Transfer-Encoding: base64\n\n" . $attachData . "\n\n" . "-{$boundary}-\n";
} catch (Exception $e) {
echo $e->getMessage();
}
if(mail($toEmail, $subject, $message, $headers)) { 
} else {
$hasError = true;
}

if($hasError) {
echo "<h2>Error Submitting form. Please check your input and try again</h2>";
} else {
header('Location: success.php');
}

我被重定向到成功页面，但从未收到过电子邮件。谢谢！