Troueble to sending email in laravel

I'm trying to send mail with SendGrid, picking up the email that the user wants to send and the message, but I'm having this error when i try to submit:

Failed to authenticate on SMTP server with username "João Gabriel" using 2 possible authenticators. Authenticator LOGIN returned Swift_TransportException: Expected response code 250 but got an empty response in ...

My Mailable:

public $remetente;
public $nome;
public $destinatario;
public $data;

public function __construct($remetente, $nome, $destinatario, $data)
{
    $this->remetente = $remetente;
    $this->nome = $nome;
    $this->destinatario = $destinatario;
    $this->data = $data;

}

public function build()
{
    //$address = 'janeexampexample@example.com';
    $subject = 'This is a demo!';
    $name = 'Jane Doe';
    return $this->view('emails.test')
                ->from($this->remetente, $this->nome)
                ->subject($subject)
                ->replyTo($this->destinatario, $name);
}

}

My Controller:

public function enviarEmail(Request $request){
    $destinatario = $request->input('destinatario');
    $mensagem = $request->input('mensagem');
    $remetente = \Auth::user()->email;
    $nome = \Auth::user()->name;

    Mail::to($destinatario)->send(new TestEmail($remetente, $nome, $destinatario, $mensagem));
}

Can someone help me?

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