Collect mail data in a variable

Good morning, thank you so much for your reply.
Let me explain my problem better, as you can see from the attached code, on the cart page I have inserted a mail function that collects the user’s order. What I should do is insert in the “to” field a variable that collects the email addresses of the stores displayed in the map above, so that the customer’s order can be sent to all these stores. Is it possible to get this variable?

<div id="sendlistform-wrapper">
	
	<h2>Invia la tua lista</h2>
	<p>Compila il form sottostante e invia la tua lista ai gommisti individuati nella mappa. Da loro riceverai in risposta un preventivo.</p>


<?php
global $woocommerce;
foreach ($woocommerce->cart->get_cart() as $item_id => $values) 
{$string .= $values['quantity'].$values['data']->get_name().',';}

 



?>
<form action="#" id="form" class="sendlistform"  method="post" name="form">
<input type="text" name="nome" placeholder="Nome"><input type="text" name="email" placeholder="Email">
<textarea name="message" placeholder="Il tuo messaggio..."></textarea>	
<button type="submit" name="send_message_btn">Send</button>
</form>
<?php 
	
if(isset($_POST['send_message_btn']))
{
$from = $_POST['email'];
$to = here the variable i should generate
$subject = "Checking PHP mail";

$headers = "From:" . $from;

mail($to, $subject,$_POST['nome'].$_POST['message'].$string, $headers);

 echo '<div id="sent" class=" align-items-center">La tua lista è stata inviata.<br>Sarai presto ricontattato.<br><a href="https://www.lucatartarini.net/area-test/mastro-new-site">Torna alla Homepage</a></div>';
}

?>

</div>