我必须使用PHP的函数mail（）发送邮件。我必须插入回复标题，但它不起作用：
<?php
$body = "<html>'n";
$body .= "<body style='"font-family:Verdana, Verdana, Geneva, sans-serif; font-size:12px; color:#666666;'">'n";
$body = $message;
$body .= "</body>'n";
$body .= "</html>'n";
$headers = "From: My site<noreply@example.com>'r'n";
$headers .= "Reply-To: info@example.com'r'n";
$headers .= "Return-Path: info@example.com'r'n";
$headers .= "X-Mailer: Drupal'n";
$headers .= 'MIME-Version: 1.0' . "'n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "'r'n";
return mail($recipient, $subject, $message, $headers); ?>
在php.net的这个例子中，有$headers.="答复："info@example.com''''r''n"；但如果复制并粘贴此邮件，然后发送邮件，则没有"答复"标头。如果在我的HTML邮件中插入其他标头，如"发件人"、"抄送"、"密件抄送"，则只有"答复"标题没有。我试过像"回复"，"回复"回复"等，但它不起作用。我用过Php 5.4能帮我吗？
试试这个。
为收件人、主题和邮件添加参数。
那么在这条线上"返回邮件（$receiver，$subject，$message，$headers）；"
将$message替换为$body。
看起来像这个
<?php
$recipient = "jack@example.com";
$subject = "test subject";
$message = "test message";
$body = "<html>'n";
$body .= "<body style='"font-family:Verdana, Verdana, Geneva, sans-serif; font-size:12px; color:#666666;'">'n";
$body = $message;
$body .= "</body>'n";
$body .= "</html>'n";
$headers = "From: My site<noreply@example.com>'r'n";
$headers .= "Reply-To: info@example.com'r'n";
$headers .= "Return-Path: info@example.com'r'n";
$headers .= "X-Mailer: Drupal'n";
$headers .= 'MIME-Version: 1.0' . "'n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "'r'n";
$result = mail($recipient, $subject, $body, $headers);
var_dump($result);
?>
希望它能帮助你