php mail met errors

<?php
$your_email = "an_alien@eugamer.com"; 


if($_POST['submit'])
{

$subject = $_POST['subject'];
$message = $_POST['message'];
$name = $_POST['name'];
$email = $_POST['email'];
}
elseif(!empty($subject))
{
echo("You did no fill in a subject!");
}
elseif(!empty($message))
{
echo("You did not fill in a message!");
}
elseif(!empty($name))
{
echo("You did not fill in your name!");
}
elseif(!empty($email))
{
echo("You did not fill in your email");
}
else
{

mail("$your_email","$subject","$message","\n verzonden door: $name \n zijn email: $email");
mail("$email","BattlefieldNet","This auto message was send by www.battlefieldnet.com. We will respond on your email as soon as possible.");

echo("Thank you, your message has been send.");

}

?>

<?php
$your_email = "an_alien@eugamer.com"; 
 
 
if($_POST['submit'])
{
 
$subject = $_POST['subject'];
$message = $_POST['message'];
$name = $_POST['name'];
$email = $_POST['email'];
}
elseif(!empty($subject))
{
echo("You did no fill in a subject!");
}
elseif(!empty($message))
{
echo("You did not fill in a message!");
}
elseif(!empty($name))
{
echo("You did not fill in your name!");
}
elseif(!empty($email))
{
echo("You did not fill in your email");
}
else
{
 
mail("$your_email","$subject","$message","\n verzonden door: $name \n zijn email: $email");
mail("$email","BattlefieldNet","This auto message was send by www.battlefieldnet.com. We will respond on your email as soon as possible.");
 
echo("Thank you, your message has been send.");
 
}
 
?>