[SSL/TLS] Support for pass the stream context

[michalbundyra]

From PHP 5.6, SSL/TLS client streams now enable peer verification by default.
So, error occurs when communicate with the server that is using a self-signed certificate.

See: http://php.net/manual/migration56.openssl.php

In order to avoid the above problem:

$options = [
    'ssl' => [
        'verify_peer_name' => false,
        'verify_peer'      => false,
    ]
];

$context = stream_context_create($options);

// ex. https://github.com/zendframework/zend-mail/blob/release-2.7.0/src/Protocol/Pop3.php#L95

// $this->socketfsockopen($host, $port, $errno, $errstr, self::TIMEOUT_CONNECTION);
$this->socketfsockopen($host, $port, $errno, $errstr, self::TIMEOUT_CONNECTION, $context);

In this way, there is a need to pass a stream context to the stream function.

However, the current Zend\Mail\Protocol\Pop3 and Zend\Mail\Protocol\Smtp look like does not provide an interface to pass stream context.
Is there support for the above interface in future?

---

A similar way: zend-http/zend.http.client.adapters.md at release-2.5.4 · zendframework/zend-http

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Originally posted by @gongo at zendframework/zend-mail#84

[michalbundyra]

I created a fork which solves this issue hard-coded here: https://github.com/Cruiser13/zend-mail
I don't think they'll add a config solution inside the core since ZF1 reached end of lifetime.

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Originally posted by @Cruiser13 at zendframework/zend-mail#84 (comment)

[michalbundyra]

Um... This component is v2, and still maintained...

On Aug 26, 2016 11:54 AM, "Lennart Sauter" notifications@github.com wrote:

I created a fork which solves this issue hard-coded here:
https://github.com/Cruiser13/zend-mail
I don't think they'll add a config solution inside the core since ZF1
reached end of lifetime.

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Originally posted by @weierophinney at zendframework/zend-mail#84 (comment)

[michalbundyra]

Sorry, I meant to post it here, got the versions mixed up: zendframework/zf1#709
So there's hope for ZF2 and this issue :)

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Originally posted by @Cruiser13 at zendframework/zend-mail#84 (comment)

[michalbundyra]

Same here. Would be great if we could disable verify_peer for Zend\Mail\Protocol\Pop3 Zend\Mail\Protocol\Smtp Zend\Mail\Protocol\Imap. This issue appears to be open for 2 years?

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Originally posted by @jensstalder at zendframework/zend-mail#84 (comment)