PHPMailer 6.1.4 fullwidth subject

[yKanazawa]

Please check these things before submitting your issue:

• Read the error message you're seeing - it often tells you what is wrong, and may contain useful links & instructions
• Make sure you're using the latest version of PHPMailer
• Check that your problem is not dealt with in the troubleshooting guide, especially if you're having problems connecting to Gmail or GoDaddy
• Include sufficient code to reproduce your problem
• If you're having an SMTP issue, include the debug output generated with SMTPDebug = 2 set
• If you have a question about how to use PHPMailer (rather than reporting a bug in it), tag a question on Stack Overflow with phpmailer, but search first!

Problem description

Versions: later than 6.0.7

In the case of $this->Mailer = 'mail';,
it seems that full width subject encoding appears to be failing.

Code to reproduce

Test Code

<?php
require 'vendor/autoload.php';
use PHPMailer\PHPMailer\PHPMailer;

$mail = new PHPMailer();

$mail->SMTPDebug = 2;
$mail->isMail();
$mail->Host = '127.0.0.1';
$mail->Encoding = "7bit";
$mail->CharSet = 'ISO-2022-JP';

$mail->setFrom('[email protected]', mb_encode_mimeheader('ＦＵＬＬＷ－ＦＲＯＭ'));
$mail->Subject = mb_encode_mimeheader('ＦＵＬＬＷ－ＳＵＢＪＥＣＴ');
$mail->Body = 'ＦＵＬＬＷ－ＢＯＤＹ';

$mail->addAddress('[email protected]');

$mail->isHTML(false);
$mail->send();

PHPMailer 6.0.7
Subject: ＦＵＬＬＷ－ＳＵＢＪＥＣＴ

Received: by app.example.com (Postfix, from userid 1000)
	id 1A4B42E157A; Wed, 22 Jan 2020 18:21:34 +0900 (JST)
To: [email protected]
Subject: =?UTF-8?B?77ym77y177ys77ys77y377yN77yz77y177yi77yq77yl77yj77y0?=
X-PHP-Originating-Script: 0:PHPMailer.php
Date: Wed, 22 Jan 2020 18:21:34 +0900
From: =?UTF-8?B?77ym77y177ys77ys77y377yN77ym77yy77yv77yt?= <[email protected]>
Message-ID: <ReFYcsIbmzkYl7kzQVqcJHLhrcbf2KxJ5PHVYKu2k@app>
X-Mailer: PHPMailer 6.0.7 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-2022-JP

ＦＵＬＬＷ－ＢＯＤＹ

PHPMailer 6.1.4
Subject: =?UTF-8?B?77ym77y177ys77ys77y377yN77yz77y177yi77yq77yl77yj77y0?=

Received: by app.example.com (Postfix, from userid 1000)
	id F32282E1579; Wed, 22 Jan 2020 18:18:07 +0900 (JST)
To: [email protected]
Subject: =?us-ascii?Q?=3D=3FUTF-8=3FB=3F77ym77y177ys77ys77y377yN77yz7?=  =?us-ascii?Q?7y177yi77yq77yl77yj77y0=3F=3D?=
X-PHP-Originating-Script: 0:PHPMailer.php
Date: Wed, 22 Jan 2020 18:18:07 +0900
From: =?UTF-8?B?77ym77y177ys77ys77y377yN77ym77yy77yv77yt?= <[email protected]>
Message-ID: <tGMMwDmGQjcmzuOcScE3gGXWoqqwYbZ7SR6ALGYE@app>
X-Mailer: PHPMailer 6.1.4 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-2022-JP

ＦＵＬＬＷ－ＢＯＤＹ

Debug output

[NiklasBr]

Are you sure you need to encode the Subject? PHPMailer will do that for you, it looks like it is double-encoded in your above example.

[Synchro]

Exactly; Don't do that!

[yKanazawa]

Test Code

<?php
require 'vendor/autoload.php';
use PHPMailer\PHPMailer\PHPMailer;

$mail = new PHPMailer();

$mail->SMTPDebug = 2;
$mail->isMail();
$mail->Host = '127.0.0.1';
$mail->Encoding = "7bit";
$mail->CharSet = 'ISO-2022-JP';

$mail->setFrom('[email protected]', mb_encode_mimeheader('ＦＵＬＬＷ－ＦＲＯＭ'));
$mail->Subject = 'ＦＵＬＬＷ－ＳＵＢＪＥＣＴ';
$mail->Body = 'ＦＵＬＬＷ－ＢＯＤＹ';

$mail->addAddress('[email protected]');

$mail->isHTML(false);
$mail->send();

PHPMailer 6.0.7
Subject: ＦＵＬＬＷ�ＳＵＢＪＥＣＴ (Garbled)

Received: by app.example.com (Postfix, from userid 1000)
	id 060B82E157C; Wed, 22 Jan 2020 18:44:49 +0900 (JST)
To: [email protected]
Subject: =?ISO-2022-JP?B?77ym77y177ys77ys77y377yN77yz77y177yi77yq77yl?=  =?ISO-2022-JP?B?77yj77y0?=
X-PHP-Originating-Script: 0:PHPMailer.php
Date: Wed, 22 Jan 2020 18:44:49 +0900
From: =?UTF-8?B?77ym77y177ys77ys77y377yN77ym77yy77yv77yt?= <[email protected]>
Message-ID: <S2z4zWDZqx0CoGtZpN1V9FLbZsCiZmqVRwYw77Z8Mo@app>
X-Mailer: PHPMailer 6.0.7 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-2022-JP

ＦＵＬＬＷ－ＢＯＤＹ

PHPMailer 6.1.4
Subject: ＦＵＬＬＷ�ＳＵＢＪＥＣＴ (Garbled)

Received: by app.example.com (Postfix, from userid 1000)
	id 695E32E157D; Wed, 22 Jan 2020 18:47:12 +0900 (JST)
To: [email protected]
Subject: =?ISO-2022-JP?B?77ym77y177ys77ys77y377yN77yz77y177yi77yq77yl?=  =?ISO-2022-JP?B?77yj77y0?=
X-PHP-Originating-Script: 0:PHPMailer.php
Date: Wed, 22 Jan 2020 18:47:12 +0900
From: =?UTF-8?B?77ym77y177ys77ys77y377yN77ym77yy77yv77yt?= <[email protected]>
Message-ID: <SDl3fAX8v2DaSC96tZL7HzBZc97Q0BLbrBOegJnLEY@app>
X-Mailer: PHPMailer 6.1.4 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-2022-JP

ＦＵＬＬＷ－ＢＯＤＹ

[yKanazawa]

Test Code

<?php
require 'vendor/autoload.php';
use PHPMailer\PHPMailer\PHPMailer;

$mail = new PHPMailer();

$mail->SMTPDebug = 2;
$mail->isMail();
$mail->Host = '127.0.0.1';
$mail->Encoding = "7bit";
$mail->CharSet = 'UTF-8';

$mail->setFrom('[email protected]', mb_encode_mimeheader('ＦＵＬＬＷ－ＦＲＯＭ'));
$mail->Subject = 'ＦＵＬＬＷ－ＳＵＢＪＥＣＴ';
$mail->Body = 'ＦＵＬＬＷ－ＢＯＤＹ';

$mail->addAddress('[email protected]');

$mail->isHTML(false);
$mail->send();

PHPMailer 6.0.7
Subject: ＦＵＬＬＷ－ＳＵＢＪＥＣＴ

Received: by app.example.com (Postfix, from userid 1000)
	id AB00A2E1580; Wed, 22 Jan 2020 18:59:21 +0900 (JST)
To: [email protected]
Subject: =?UTF-8?B?77ym77y177ys77ys77y377yN77yz77y177yi77yq77yl77yj77y0?=
X-PHP-Originating-Script: 0:PHPMailer.php
Date: Wed, 22 Jan 2020 18:59:21 +0900
From: =?UTF-8?B?77ym77y177ys77ys77y377yN77ym77yy77yv77yt?= <[email protected]>
Message-ID: <Rfb1EpNhenkR4trhFX2YKxiUVnBqvueqVHtfWCfOu4@app>
X-Mailer: PHPMailer 6.0.7 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8

ＦＵＬＬＷ－ＢＯＤＹ

PHPMailer 6.1.4
Subject: ＦＵＬＬＷ－ＳＵＢＪＥＣＴ

Received: by app.example.com (Postfix, from userid 1000)
	id AD1802E157F; Wed, 22 Jan 2020 18:57:20 +0900 (JST)
To: [email protected]
Subject: =?UTF-8?B?77ym77y177ys77ys77y377yN77yz77y177yi77yq77yl77yj77y0?=
X-PHP-Originating-Script: 0:PHPMailer.php
Date: Wed, 22 Jan 2020 18:57:20 +0900
From: =?UTF-8?B?77ym77y177ys77ys77y377yN77ym77yy77yv77yt?= <[email protected]>
Message-ID: <ezNu7ngZK06RCVmF6gkH5FNTD3UZT2ZJmWiGRU3Evjk@app>
X-Mailer: PHPMailer 6.1.4 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8

ＦＵＬＬＷ－ＢＯＤＹ

[Synchro]

Don't do this:

$mail->setFrom('[email protected]', mb_encode_mimeheader('ＦＵＬＬＷ－ＦＲＯＭ'));

Just do this:

$mail->setFrom('[email protected]', 'ＦＵＬＬＷ－ＦＲＯＭ');