User email validation opt-out enableIdn

[Anubarak]

Description

One of those kinda breaking changes again. I know this is actually a feature request but I consider it as a bug because it causes errors and exceptions and breaks the current workflow in our application.
In one of your updates you enabled enableIdn for Yii2 E-Mail validator.
Now E-Mails like

äöêèé#####@äöêèéß.de

are totally fine. Unfortunately Swiftmailer throws an exception when trying to send an E-Mail to this address.
We could easily add a custom email validation via event on top of yours but that feels like a strange work-around.
It would be much better if you could opt-out via setting if you really want to allow emails with special characters.

Steps to reproduce

1. Create a user with an E-Mail like "äöêèé#####@äöêèé.de"
2. Save the user with "send confirmation mail"
3. See the user is saved but an exception is thrown because the E-Mail is not valid for Swift, the user cannot reset their password as well.

Additional info

• Craft version: 3.6.14

I guess it's due to this issue #7103 but it worked correctly before (validator fails because it's no valid E-Mail)

$email = 'äöêèé#####@äöêèé.de';
$validator = new \yii\validators\EmailValidator();
if ($validator->validate($email, $error)) {
    echo 'Email is valid.';
} else {
    echo $error;
}

prints is not a valid email address which is totally correct. Doing the same with a User won't trigger the validator but the Exception

[87.139.0.246][1071821][e0iksd8t8iu0lg64v3fdu7oujo][error][Swift_AddressEncoderException]
Swift_AddressEncoderException: Non-ASCII characters not supported in local-part in
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/AddressEncoder/IdnAddressEncoder.php:40
Stack trace:
#0
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/Headers/MailboxHeader.php(334):
Swift_AddressEncoder_IdnAddressEncoder->encodeString('g\xC3\xBCnter.haupt@m...')
#1
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/Headers/MailboxHeader.php(303):
Swift_Mime_Headers_MailboxHeader->createNameAddressStrings(Array)
#2
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/Headers/MailboxHeader.php(246):
Swift_Mime_Headers_MailboxHeader->createMailboxListString(Array)
#3
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/SimpleHeaderSet.php(309):
Swift_Mime_Headers_MailboxHeader->getFieldBody()
#4
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/SimpleMimeEntity.php(476):
Swift_Mime_SimpleHeaderSet->toString()
#5
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/SimpleMessage.php(576):
Swift_Mime_SimpleMimeEntity->toString()
#6
/home/myspambr/www.myspa.me/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Message.php(142):
Swift_Mime_SimpleMessage->toString()
#7
/home/myspambr/www.myspa.me/vendor/yiisoft/yii2-swiftmailer/src/Message.php(428):
Swift_Message->toString()
#8
/home/myspambr/www.myspa.me/vendor/yiisoft/yii2-debug/src/panels/MailPanel.php(89):
yii\swiftmailer\Message->toString()
#9 [internal function]:
yii\debug\panels\MailPanel->yii\debug\panels\{closure}(Object(yii\mail\MailEvent))
#10
/home/myspambr/www.myspa.me/vendor/yiisoft/yii2/base/Event.php(312):
call_user_func(Object(Closure), Object(yii\mail\MailEvent))
#11
/home/myspambr/www.myspa.me/vendor/yiisoft/yii2/base/Component.php(637):
yii\base\Event::trigger('yii\\mail\\BaseMa...', 'afterSend',
Object(yii\mail\MailEvent))
#12
/home/myspambr/www.myspa.me/vendor/yiisoft/yii2/mail/BaseMailer.php(396):
yii\base\Component->trigger('afterSend', Object(yii\mail\MailEvent))
#13
/home/myspambr/www.myspa.me/vendor/craftcms/cms/src/mail/Mailer.php(184):
yii\mail\BaseMailer->afterSend(Object(craft\mail\Message), false)
#14
/home/myspambr/www.myspa.me/vendor/yiisoft/yii2/mail/BaseMessage.php(49):
craft\mail\Mailer->send(Object(craft\mail\Message))
#15
/home/myspambr/www.myspa.me/vendor/craftcms/cms/src/services/Users.php(351):
yii\mail\BaseMessage->send()
#16
/home/myspambr/www.myspa.me/modules/api/v1/controllers/UserController.php(1122):
craft\services\Users->sendActivationEmail(Object(craft\elements\User))
#17 [internal function]:

[brandonkelly]

Thanks for pointing that out. I’ve reported the bug to Yii (yiisoft/yii2#18734) and submitted a PR that could help us fix it (yiisoft/yii2#18735).

[brandonkelly]

Yii 2.0.23 was released, so this bug is now fixed for the next Craft release.

[brandonkelly]

Craft 3.7.9 is out now with the fix.