Most websites have a standard Jobs by Email system (or at least they should have!), which is usually based upon the candidate registration form. You select your sector, salary and location and receive emails when a job is matched to your standard registration form.
Our new jobs board have a Profile based Job Alert system. This means that the Jobs by Email is not based upon your initial registration, but based upon the actual job profile that you want.
After registering, the candidate will go to the Job Alerts section and they can create a number of different Job Alert profiles based upon differing criteria. The candidate may have a number of different Job Alert profiles, each matching a certain skill set. They can receive these Job Alert emails seperately or they can combine them into a single Job Alert email.