Mail recepients with German umlaut are not accepted

[michalbundyra]

This issue has been moved from the zendframework repository as part of the bug migration program as outlined here - http://framework.zend.com/blog/2016-04-11-issue-closures.html

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Original Issue: https://api.github.com/repos/zendframework/zendframework/issues/7654
User: @renecatharsis
Created On: 2015-12-21T12:08:38Z
Updated At: 2016-02-13T15:34:02Z
Body
Hi,

since ZF v2.4.x, I cannot send any mails to recepients containing German umlauts in their mail address.
For exmaple: testäöü@gmail.com
Encoding is set to UTF-8 on Zend\Mail\Message object.
The following expection is thrown:

#0 foobar\vendor\zendframework\zend-mail\src\Header\AbstractAddressList.php(114): Zend\Mail\Header\HeaderValue::assertValid('test\xC3\xA4\xC3\xB6\xC3\xBC@gmai...')
#1 foobar\vendor\zendframework\zend-mail\src\Header\AbstractAddressList.php(158): Zend\Mail\Header\AbstractAddressList->getFieldValue(true)
#2 foobar\vendor\zendframework\zend-mail\src\Headers.php(422): Zend\Mail\Header\AbstractAddressList->toString()
#3 foobar\vendor\zendframework\zend-mail\src\Transport\Smtp.php(332): Zend\Mail\Headers->toString()
#4 foobar\vendor\zendframework\zend-mail\src\Transport\Smtp.php(238): Zend\Mail\Transport\Smtp->prepareHeaders(Object(Zend\Mail\Message))
#5 foobar\vendor\Solar\library\Solar\Mail\Mail.php(144): Zend\Mail\Transport\Smtp->send(Object(Zend\Mail\Message))
#6 foobar\vendor\Solar\library\Solar\Client\AbstractClient.php(249): Solar\Mail\Mail->sendSmtp('processrevenuec...', Array, true, '')
#7 foobar\modules\eonde\Processrevenuecheck.php(73): Solar\Client\AbstractClient->sendMail('test\xC3\xA4\xC3\xB6\xC3\xBC@gmai...', '', Array)
#8 foobar\vendor\Solar\library\Solar\Bootstrap\Bootstrap.php(248): modules\eonde\Processrevenuecheck->run()
#9 foobar\index.php(80): Solar\Bootstrap\Bootstrap->getResponse()
#10 {main}```

Umlauts work fine with the subject and body.
Also, the value passes the \Zend\Validate\EmailAddress validator.
It might be related to this issue although I cannot gain any workaround from it:
https://github.com/zendframework/zf2/issues/7501

Update:
Seems like RFC6531 was implemented in zend-validate but not yet zend-mail.

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Originally posted by @GeeH at https://github.com/zendframework/zend-mail/issues/98

[michalbundyra]

That's because this is not possible without support for SMTPUTF8 from RFC 6581. UTF-8 in headers and body are handled using 8BITMIME, but that has no bearing on the SMTP layer.

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Originally posted by @Synchro at zendframework/zend-mail#98 (comment)

[Hexmage]

duplicate of #67