Envoi données d'un formulaire vers email en PHP

<form action = "envoi.php" method="post" name= "Submit"> <div class="col-md-6 to-animate-2">
<h3> Formulaire de contact</h3>
<div class="form-group ">
<label for="name" class="sr-only">Nom</label>
<input id="name" class="form-control" placeholder="Name" type="text">
</div>
<div class="form-group ">
<label for="email" class="sr-only">Email</label>
<input id="email" class="form-control" placeholder="Email" type="email">
</div>
<div class="form-group">
<label for="occation" class="sr-only">Occasion</label>
<select class="form-control" id="occation">
<option>Sélectionnez</option>
 <option>Repas quotidien</option>
 <option>Buffet</option>
 <option>Autres</option>
</select>
</div>
<div class="form-group ">
<label for="date" class="sr-only">Date</label>
<input id="date" class="form-control" placeholder="Date & Time" type="text">
</div>
 
 
 
<div class="form-group ">
<label for="message" class="sr-only">Message</label>
<textarea name="" id="message" cols="30" rows="5" class="form-control" placeholder="Message"></textarea>
</div>
<div class="form-group ">
<input class="btn btn-primary" value="Envoyer" name="envoi" type="submit">
</div>
 

<?php
 
$EmailFrom = $_POST['email']; 
$EmailTo = "contact@monsite.com";
$Subject = "Un message sur mon site";
$Nom = $_POST['name']; 
$Email = $_POST['email'];
$Occasion = $_POST['occation'];
$Message = $_POST['message']; 
 
// validation
$validationOK=true;
if (!$validationOK) {
  echo "Error";
  exit;
}
 
// mise en form mail
$Body = "";
$Body .= "Nom: ";
$Body .= $Nom;
$Body .= "\n";
$Body .= "Email: ";
$Body .= $Email;
$Body .= "\n";
$Body .= "Message: ";
$Body .= "\n";
$Body .= $Message;
$Body .= "\n";
 
// envoi email 
$success = mail($EmailTo, $Subject, $Body, "From: <$EmailFrom>");
 
// message success-error
if ($success){
  echo "Votre message à bien été envoyé.";
}
else{
  echo "Une erreur s'est produite à l'envoi de votre message.";
}
?>