php 邮件功能在 windows 下运行良好，但在 linux 服务器上运行不佳

Question

我使用的邮件功能在 Windows 中运行良好，但在 Linux 服务器中却不行。我的代码有什么问题。任何人都可以为此提供一些想法/更好的解决方案。我还引用了一些 SMTP 选项，但在运行时都会抛出错误。

  <?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
$email_recipient = "staff@inpws.com";
$email_subject="hi";
$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= "From: info@oktakes.com\r\n"; 
$headers .= "Reply-To: info@oktakes.com";

$email_result = mail($email_recipient, $email_subject, "hiuu", $headers);
if ($email_result){ echo "Email has been sent!"; }
else{ echo "Email has failed!"; }
?>

Answer 1

$email_header 不存在。

$email_result = mail($email_recipient, $email_subject, $email_contents, $headers);

并且在 $headers 变量的第三行中应该是 \r\n 而不是 \n。

$headers .= "From: info@oktakes.com\r\n";