You should now be able to log in to your account via webmail. There will be 2 messages, one is a welcome and the other is a SPAM test to show it's working. I forgot to mention that you can access the mail server from any email client (i.e. Thunderbird, MS Outlook, etc) as well within your network.

You can now add the Mailman software to your Amahi Mail System. Follow the instructions at [http://wiki.amahi.org/index.php/Amahi_Mailman Amahi Mailman].