How do I cancel my account? And for receiving email?
When you say cancel your account, do you mean deleting your Todoist account. If that's what you mean, you can delete your account by going to the Todoist Setting -> Go to the ACCOUNTS tab -> Click on "Delete my Todoist account".
Regarding your question about receiving email, do you mean a confirmation that you account has been deleted? If not, please clarify what exactly you mean.