The list of the users that supported you is available at any time from your project page, in the section “My supporters” in the blue ribbon at the top of the page.
By clicking on the link “excel or csv” next to the Export supporters option, you will get a file in that format sent to your email address within minutes. You will have the name, username, and email address of each supporter as well as the chosen reward and the delivery address.
(If some addresses are missing, it’s because the supporter hasn’t provided it yet. To do so, they have to go to their section “My transactions” and click on “Edit the address and preferences” link next to the contribution to your project).
You also have the option to publish a private news, which will be sent to them by email too.