No, Dodo webmail is not down. You can use the following links to access the service:
https://webmail.dodo.com.au/
https://www.dodo.com.au/custserv/webmail-helpdesk.do
If you are still experiencing problems, please get in touch with Dodo webmail support via Live Chat or call 13 39 30. You can also use Dodo Webmail Contact Us form and submit your query. We will respond as soon as possible!