A busy study can generate a lot of notices. Messages and Notifications are delivered inside the platform while you're online, as well as delivered by email.
Depending on the Study you are participating in, you may be able to modify the frequency at which you receive email notifications. You can do this from your Account Settings page, or by clicking Modify frequency of email notifications in the footer of an email you have already received.
You can also Unsubscribe from emails entirely:
If you have concerns about the email notifications you are receiving from the Study you are participating in, you can contact your study Moderator(s) from the Messages area.