The types of emails you receive from Quora can be adjusted by going to your Settings page, then clicking on "Email & Notifications" in the left-side navigation menu (or by visiting http://www.quora.com/settings/notifications).
Additionally, most notifications and content emails that you receive from Quora will have an unsubscribe link located at the bottom of the email that you can use to opt out of that email type.
However, please note that certain emails from Quora - such as updates to our Terms of Service or Privacy policy - are legally required and users cannot opt out of these mandatory notices.
Additionally, if you are a Space admin, it is important for you to receive notifications relevant to your Space, such as requests from Space members, updates about your Space, and content moderation notices. If you are an admin of one or more Spaces and you wish to no longer receive notifications for the Space, you can remove yourself as an admin of the Space.
If you wish to no longer receive any communications from Quora, you can delete your account following the instructions provided here.