Students should sign into their accounts at your custom domain (http://yourclass.ed.voicethread.com/). If they sign in here, students using fictitious email addresses can enter just their usernames. The rest of the email address will be filled in for them.
For example, a student could enter “john.smith” as his username. When he goes to enter his password, the rest of the address will auto-fill for him, so he’ll see firstname.lastname@example.org. This simplifies the sign-in process for students who aren’t using valid email addresses.