Hi there. The email was indeed from us, there is no need to worry. If you don't wish to continue using 1Password, you can contact support@1password.com and they can help you delete your account so you'll no longer be asked to complete registration.
新功能
Localization has been improved for a number of our supported languages using new translations from Crowdin. We've updated some wording in the Autofill Behavior menu. "Only fill on this exact domain" is now "Only fill on this exact host", and ports are now included in the description. We've fixed an issue where you'd see an an "offline" error if you tried to switch accounts while in the "Setup another device" page. We've fixed a visual issue with the Autofill page.