Попробывал без JS , все-равно не работает,вот новый код формы,вроде-бы всё правильно
<form id="form" method="post" action="form.php">
<div class="form-group">
<label for="exampleInputEmail">Email address</label>
<input name="email" type="email" class="form-control" id="exampleInputEmail" aria-describedby="emailHelp" placeholder="Enter email">
</div>
<div class="form-group">
<label for="exampleInputText">Name</label>
<input name="name" type="text" class="form-control" id="exampleInputText" placeholder="Name">
</div>
<div class="form-group">
<label for="exampleInputPassword">Password</label>
<input name="password" type="password" class="form-control" id="exampleInputPassword" placeholder="Password">
</div>
<div class="form-group">
<textarea name="textarea" id="textarea" class="form-control"></textarea>
</div>
<!-- <button class="btn btn-success" id="send">Submit</button>-->
<input type="submit">
</form>
<div id="mess"></div>
