You now have a functional mailing list system. But it may not be all that you would like it to be. There are many ways to make it more user friendly, to exercise control over what users post, and to theme outgoing messages. With additional contributed modules you can:

• Set up moderated mailing lists
• Allow each user to post from more than one email address
• Create message templates that promote your site's brand
• Allow users to upload and share files and photos attached to their emails

The starting point is the list of optional modules.