I'm using the following code in my template for a Mailing List form, but it doesn't seem to be working.

```
{exp:mailinglist:form
    list="default"
}
    <div class="form-group">
        <label for="email">Email address</label>
        <input type="text" class="form-control" id="email" placeholder="Enter email" name="email" value="{email}">
    </div>
    <input type="submit" name="submit" value="Submit" class="btn btn-primary">
{/exp:mailinglist:form}

```

The form seems to post though no email appears in my default mailing list. Any thoughts on what could be the issue? I'm on 2.7 and am using .htaccess to remove the index.php.