PHP Sendmail发送的电子邮件内容在包含CSS内联样式时未显示 - PHP Sendmail sent emails content not showing when it contains CSS inline styling

我有一个非常奇怪的问题，我似乎找不到原因。我知道为什么它显然是造成的，虽然...这是电子邮件的 HTML 内容包含内联 CSS 样式时。当我删除内联样式时，电子邮件到达正常。当我添加它时，它没有。

我像这样运行脚本：

$text_message = 'HELLO! Some more email content goes here';
$html_message = '<table>
<tbody><tr>
<td class="mcnTextContent" style="padding-top: 9px;padding-right: 18px;padding-bottom: 9px;padding-left: 18px;mso-table-lspace: 0pt;mso-table-rspace: 0pt;-ms-text-size-adjust: 100%;-webkit-text-size-adjust: 100%;color: #606060;font-family: Helvetica;font-size: 15px;line-height: 150%;text-align: left;" valign="top">
<h3 style="margin: 0;padding: 0;display: block;font-family: Helvetica;font-size: 18px;font-style: normal;font-weight: bold;line-height: 125%;letter-spacing: -.5px;text-align: left;color: #606060 !important;">HELLO!</h3>Some more email content goes here
</td>
</tr>
</tbody></table>';

$link = 'link';
$text_message = sprintf($text_message, $msg_details['name'], $link, $this->setts['sitename']);
$html_message = sprintf($html_message, $msg_details['name'], $link, $this->setts['sitename']);
send_mail($msg_details['email'], 'Message Received - ' . $setts['sitename'], $text_message, 
    $this->setts['admin_email'], $html_message, null, $send);

然后"send_mail"函数的后端是：

function send_mail($to, $subject, $text_message, $from_email, $html_message = null, $from_name = null, $send = true, $reply_to = null) 
{
    global $setts, $current_version;
    if ($send)
    {
        ## set date
        $tz = date('Z');
        $tzs = ($tz < 0) ? '-' : '+';
       $tz = abs($tz);
        $tz = ($tz / 3600) * 100 + ($tz % 3600) / 60;
        $mail_date = sprintf('%s %s%04d', date('D, j M Y H:i:s'), $tzs, $tz);
        $uniq_id = md5(uniqid(time()));
        ## create the message body
        $html_message = ($html_message) ? $html_message : $text_message;
        $html_msg = "<!--'n" . $text_message . "'n-->'n". "<html><body>". $html_message . "</body></html>";
        $from_name = (!empty($from_name)) ? $from_name : GMSG_MAIL_FROM_ADMIN;
        switch ($setts['mailer'])
        {
            case 'sendmail': ## send through the UNIX Sendmail function
                ## create header
                $header = "Date: " . $mail_date . "'n".
                    "Return-Path: " . $from_email . "'n".
                    "To: " . $to . "'n".
                    "From: " . $from_name . " <" . $from_email . ">'n".
                    (($setts['enable_bcc']) ? "Bcc: " . $setts['admin_email'] . "'n" : "").
                    "Reply-to: " . ((!empty($reply_to)) ? $reply_to : $from_email) . "'n".
                    "Subject: " . $subject . "'n".
                    sprintf("Message-ID: <%s@%s>%s", $uniq_id, $_SERVER['SERVER_NAME'], "'n").
                    "X-Priority: 3'n".
                    "X-Mailer: Sendmail [version " . $current_version . "]'n".
                    "MIME-Version: 1.0'n".
                    "Content-Transfer-Encoding: 7bit'n".
                    sprintf("Content-Type: %s; charset='"%s'"","text/html",LANG_CODEPAGE).
                    "'n'n";
                if ($from_email)
                {
                    $output = sprintf("%s -oi -f %s -t", $setts['sendmail_path'], $from_email);
                }
                else
                {
                    $output = sprintf("%s -oi -t", $setts['sendmail_path']);
                }
                if(!@$mail = popen($output, "w")) 
                {
                    echo GMSG_COULDNT_EXECUTE . ': ' . $setts['sendmail_path'];
                }
                fputs($mail, $header);
                fputs($mail, $html_msg);
                $result = pclose($mail) >> 8 & 0xFF;
                if($result != 0) 
                {
                    echo GMSG_COULDNT_EXECUTE . ': ' . $setts['sendmail_path'];
                }
                break;
        }
    }
}

我知道，代码很乱...但这不是我自己的，这是我正在编辑的剧本。问题只是...每当我删除"样式..."在 $html_message 变量中，HTML 电子邮件显示正确，包括 h3 样式等。当我添加样式时，它只显示 $text_message 内容。

哪个部分可以剥离或禁用HTML代码？

可能是您的邮件客户端或邮件过滤器。

您似乎非常了解Sendmail，请做一些测试

sendmail -oi -t < /tmp/email.txt