Smtpauth.php

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<?php
namespace Magento\Config\Model\Config\Source\Email;

class Smtpauth implements \Magento\Framework\Option\ArrayInterface
{
    public function toOptionArray()
    {
        return [
            ['value' => 'NONE', 'label' => 'NONE'],
            ['value' => 'PLAIN', 'label' => 'PLAIN'],
            ['value' => 'LOGIN', 'label' => 'LOGIN'],
            ['value' => 'CRAM-MD5', 'label' => 'CRAM-MD5']
        ];
    }
}