PlainAuthenticator example

public function __construct(string $host = 'localhost', int $port = 0, bool $tls = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null, AbstractStream $stream = null, array $authenticators = null)
    {
        parent::__construct($stream, $dispatcher, $logger);

        if (null === $authenticators) {
            // fallback to default authenticators             // order is important here (roughly most secure and popular first)             $authenticators = [
                new Auth\CramMd5Authenticator(),
                new Auth\LoginAuthenticator(),
                new Auth\PlainAuthenticator(),
                new Auth\XOAuth2Authenticator(),
            ];
        }
        $this->setAuthenticators($authenticators);

        /** @var SocketStream $stream */
        $stream = $this->getStream();

        if (null === $tls) {
            if (465 === $port) {
                $tls = true;
            }