The email address on the trial dialog is required. This is so we can follow up with you (no more than once) to see how your trial is going.
The email address on the activation and reactivation dialogs is optional. You will be able to activate even if you do not provide an email address. If you do provide an email address, it can be used to retrieve a lost password. If you do provide the email address it will not be used for marketing purposes or sold / provided to any third party. If you do provide an email address we recommend it be one that will be active for some time.