How to send a radio button and a checkbox value from a html form with php?

I'm creating a form with select, input, radio buttons and checkboxes and others. Part of the code where is the part of my question is like this:

formulario.html

<form action="suporte_email.php" method="post" name="formulario" id="formulario" >

    <div class="conjunto7" id="conjunto7">
                   <label for="garantia">Garantia</label><br>
                     <div>
                         <input id="radio1" type="radio" name="radio"  value="Sim">
                            <label for="radio1"><span><span></span></span> Sim </label>
                         </div>
                         
                         
                     <div>
                           <input id="radio2" type="radio" name="radio"  value="Não">
                            <label for="radio2"><span><span></span></span> Não </label>
                         </div>
    </div>
                  
                  <br><br><br><br>
                  
    <div class="conjunto8" id="conjunto8">
                   <label for="contrato">Contrato</label><br>
                      <div>
                            <input id="checkbox1" type="checkbox" name="checkbox"  value="Sim">
                             <label for="checkbox1"><span></span> Sim </label>
                          </div>
                  
                          <div>
                            <input id="checkbox2" type="checkbox" name="checkbox"  value="Não">
                                 <label for="checkbox2"><span></span> Não </label>
                          </div>
    </div>

</form>

suporte_email.php

//Get Data
$nome = $_POST['nome'];                    
$empresa = $_POST['empresa'];              
$contacto = $_POST['contacto'];            
$email = $_POST['email'];                  
$marca = $_POST['marca'];                   
$other = $_POST['other'];                    
$serial_number = $_POST['serial_number'];     
$garantia = $_POST['garantia'];               
$contrato = $_POST['contrato'];             
$permissoes = $_POST['permissoes'];           
$descricao_avaria = $_POST['descricao_avaria'];
$checkbox = $_POST['checkbox'];
$radio = $_POST['radio'];

   // Parse/Format/Verify Data
   $to      = "teste@gmail.com"; 
   $from    = '';
   $subject = "Formulário de Suporte";

   $email_body = "$crlf De: $nome$crlf Email: $email$crlf Assunto: $subject$crlf$crlf Empresa: $empresa$crlf Contacto: $contacto$crlf Marca: $marca$crlf Outra: $other$crlf Número de Série: $serial_number$crlf Garantia: $garantia$crlf Contrato: $contrato$crlf Tipo de Suporte: $permissoes$crlf$crlf Descrição da Avaria: $descricao_avaria";

   // Setup EMAIL headers, particularly to support UTF-8
   // We set the EMAIL headers here, these will be sent out with your message
   // for the receiving email client to use.
   $headers = 'From: ' . $from  . $crlf .
           'Reply-To: ' . $email  . $crlf .
           'Content-Type: text/plain; charset=UTF-8' .  $crlf .
           'Para: Website'  .  $to . $crlf .
           'X-Mailer: PHP/' . phpversion();


   // Then we pass the headers into our mail function
   mail($to, $subject, $email_body, $headers);
   header('Location: agradecimentos.html');

}

Basically the variables from the radio button and from the checkbox don't appear when i receive the email. I want to receive the selected value from the radio and from the checkbox.

P:S: Also tried to change where is $garantia for $radio and where is $contrato for $checkbox.

Thanks for the help in advance! :D