Mail Class Error

To my knowledge, you can't specify any cypher with ssl. It's based on the systems OpenSSL version.
Here are the copy of the code connecting to the server.

Does the debug specify something more specific, on where it fails?

PHP Code:

    protected function SMTPConnect()
    {
        if (is_resource($this->SMTPConnect))
        {
            return true;
        }
        $ssl               = ($this->SMTPCrypto === 'ssl') ? 'ssl://' : '';
        $this->SMTPConnect = fsockopen(
                $ssl . $this->SMTPHost, $this->SMTPPort, $errno, $errstr, $this->SMTPTimeout
        );
        if (! is_resource($this->SMTPConnect))
        {
            $this->setErrorMessage(lang('Email.SMTPError', [$errno . ' ' . $errstr]));
            return false;
        }
        stream_set_timeout($this->SMTPConnect, $this->SMTPTimeout);
        $this->setErrorMessage($this->getSMTPData());
        if ($this->SMTPCrypto === 'tls')
        {
            $this->sendCommand('hello');
            $this->sendCommand('starttls');
            $crypto = stream_socket_enable_crypto($this->SMTPConnect, true, STREAM_CRYPTO_METHOD_TLS_CLIENT);
            if ($crypto !== true)
            {
                $this->setErrorMessage(lang('Email.SMTPError', $this->getSMTPData()));
                return false;
            }
        }
        return $this->sendCommand('hello');
    }