you can disable the Daily Digest email by using the "click here to unsubscribe" link at the bottom of each mail.
You can't disable any other notifications, though, but we will add such option to our system in the future. For now, as a workaround, you can block email addresses from which you receive our notifications in your email client.
I have the same problem, and as soon as I delete the e-mail notifications, they start coming again and again! This is happening in gmail, and I am not even suscribed to the todoist caledar on my gmail account!
please clarify - are you referring to email reminders? If so - have you changed the settings (Preferences -> Reminders) to "no default reminder"? If not, each time you include a particular due time to a task (for example - today at 16:00), a reminder will be set automatically to 30 minutes before deadline.