Adding a custom alert

Hello,
The documentation doesn't have information on email notifications yet, so I'm hoping you can help me here.

I'm trying to add email notifications for any post added to the general stream.

I've added an email template file to "/components/com_easysocial/themes/wireframe/emails/stream/updates.php" and I've modified/discovered the stream.alert file:

[

    {

        "element"   : "stream",

        "rule"      : "tagged",

        "core"      : true

    },

    {

        "element"   : "stream",

        "rule"      : "updates",

        "core"      : true

    }

]

What else do I need to add to the site to enable the email notifications?