You can set your preference for receiving notification emails by going to your Settings & Billing > Preferences.
Email notifications about job applicants can be set to one of four options:
No emails - only see applicants when logged in to WNW
As soon as someone applies - a notification for each individual applicant
Once a day digest - all applicants from one-day period in a single email
Once a week digest - all applicants from a one-week period in a single email
Here's what the preference settings section looks like: