CakePHP：使用电子邮件组件在电子邮件标题中添加“列表退订”

Question

我正在使用 cakephp 2.x 并使用电子邮件组件发送电子邮件。

我正在尝试在标题处添加 List-Unsubscribe。

$this->Email->headers = [
'List-Unsubscribe'=>'<mailto:'.$email_from.'?subject=Remove from Mailing List>, <'.$SITEURL.'unsubscribe?em='.$email_to.'>',
'List-Unsubscribe-Post'=>'List-Unsubscribe=One-Click' 
];

现在在电子邮件源中，它显示在 X-header 中。

X-List-Unsubscribe: <mailto:clients@example.com?subject=Remove from Mailing List>, <http://example.com/unsubscribe?em=xyz@example.com>
X-List-Unsubscribe-Post: List-Unsubscribe=One-Click

但它没有显示带有 From 的取消订阅链接。

我需要在邮件标题中列出取消订阅以避免垃圾邮件。

当我尝试使用 $this->Email->additionalParams 时，它没有在电子邮件标题中显示 List-Unsubscribe。

这是我正在使用的代码

$send_from = $email_from_name . "<" . $email_from . ">";
$this->Email->sendAs = 'both'; // text / html / both
$this->Email->from = $send_from; 
$this->Email->replyTo = $email_from;
$this->Email->return = $email_from; 
$this->Email->to = $email_to;
$this->Email->delivery = 'smtp';
$this->Email->smtpOptions = ['host'=>$imap_server,'port'=>587,'username'=>$email,'password'=>$password];
$this->Email->subject = $subject;

$this->Email->headers = [
'List-Unsubscribe'=>'<mailto:'.$email_from.'?subject=Remove from Mailing List>, <'.SITEURL.'unsubscribe?em='.$email_to.'>',
'List-Unsubscribe-Post'=>'List-Unsubscribe=One-Click' ];
$this->Email->textMessage = $this->_html_to_text($content);
//$this->Email->delivery = 'debug';
$this->Email->send($content);

Answer 1

电子邮件组件不支持自定义的非 X 前缀标头，如果需要，您必须使用 CakeEmail，默认情况下不使用前缀标头，并要求您显式传递前缀标头以防万一必填。

鉴于the email component is long deprecated，自从第一次发布 CakePHP 2 以来，现在可能是你最终放弃它的好时机。

快速而肮脏的例子：

App::uses('CakeEmail', 'Network/Email');

// The transport/connection configuration should probably better be moved into a config file
$Email = new CakeEmail(array(
    'transport' => 'Smtp',
    'host' => $imap_server,
    'port' => 587,
    'username' => $email,
    'password' => $password
));
$Email
    ->emailFormat('both')
    ->template('subscribe')
    ->from($send_from)
    ->replyTo($email_from)
    ->returnPath($email_from)
    ->to($email_to)
    ->subject($subject)
    ->addHeaders(array(
        'List-Unsubscribe' =>
            '<mailto:' . $email_from . '?subject=Remove from Mailing List>, ' .
            '<' . $SITEURL . 'unsubscribe?em=' . $email_to . '>',
        'List-Unsubscribe-Post' => 'List-Unsubscribe=One-Click'
    ))
    ->send($content);

这需要两个模板，一个用于app/View/Emails/html/subscribe.ctp 中的 HTML：

<?php
// $content contains the data passed to the `send()` method, wrapped to max 998 chars per line
echo $content;

还有一个用于app/View/Emails/text/subscribe.ctp 中的文本，要求您将 HTML 到文本的转换移动到模板中。你应该make it a helper，下面应该只是说明原理：

<?php
echo _html_to_text($content);

另见

• Cookbook > Core Libraries > Utilities > CakeEmail > Configuration
• Cookbook > Core Libraries > Utilities > CakeEmail > Sending templated emails