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PHP mail sending corrupted headers

I'm working on sending an email from a PHP script. When the mail() function is triggered, the recipient's mailbox is hosted by a specific service (seznam.cz) and the message is downloaded to the mail client (Mozilla Thunderbird) and ESET antivirus software Checking, the message appears to be corrupted.

I believe that the problem is caused by antivirus software inserting special headers in mail messages and leaving empty lines after them:

...
Subject: =?UTF-8?B?Tm92w70gxI1sZW4gd2VidSBBU1AgxIxSIQ==?=
X-EsetId: 37303A298C7FEE69657363

X-PHP-Originating-Script: 80:script.php
MIME-Version: 1.0
Content-type:text/html;charset=UTF-8
...

My email client thinks the message is plain text and starts with the line X-PHP-Originating-Script. The remainder of the message includes all HTML markup.

This is the script I use to send the email: 

$subject = mb_encode_mimeheader('Subject text');
$emailBody = '<!DOCTYPE html>
<html lang="cs">
    ...
</html>';
$emailAltBody = "...";

$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers .= 'From: <email.address@example.com>' . "\r\n";

$result = mail("email.address@example.com", $subject, $emailBody, $headers);

However, when using the Laravel framework, the email is sent and displayed correctly. I compared the differences and realized that the X-PHP-Originating-Script header is not sent by Laravel.

Could this be the reason? How can I solve it?

P粉979586159P粉979586159513 days ago697

reply all(1)I'll reply

  • P粉573943755

    P粉5739437552023-09-08 00:38:50

    This may just be a problem of different line separators.

    Until PHP 7.4 the delimiter after X-PHP-Originating-Script was just \n (this has changed in PHP 8 using \r\n, and even more recently in master making decisions based on other factors).

    Since all other headers are concatenated using \r\n, antivirus software may cause some confusion when adding headers. This results in a double newline, which is interpreted by the client as the start of the body.

    View the original message with an editor that displays all characters, including \n and \r, and you may understand it better.

    The solution is to match the line endings of the PHP version, or remove the X-PHP-Originating-Script header at all settings mail.add_x_header = Off in php.ini middle.

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