first of all, you need quotation marks around your array references: $_POST['F_email']
second, i would recommend moving this line:
$userfrom=$_POST[F_email];
up to the top and using it for $msg= stuff, otherwise, do this:
$msg="Name :\t{$_POST['F_name']}\n";
$msg.="E-Mail :\t{$_POST['F_email']}\n";
third, i'm not sure Name and Email are valid headers, i think what you are trying to do is this:
$msg="From: {$_POST['F_name']}\n";
$msg.="Reply-To: {$_POST['F_email']}\n";
those work fine for my mail() needs.
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