More tips for MailChimp users. We discovered that the internal list name we chose (“Master List”) was exposed to our subscribers when they click on why did I get this? in the footer of the email. Also, if you want to edit the content on that page—for example to add your logo and make it look more legitimate—click on the list, then click Settings > Required email footer content.
Similarly, when subscribers click on the update subscription preferences link, they go to a page for where they can update their display name and email address, and any other fields you've defined. On that form, MailChimp shows them all of the categories and groups you've created and let's them change which groups they are in. So make sure those names are donor-friendly!