Job Alert Notifications

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How do job alert notifications actually work? We've had Taleo up and running for over a year now and I've recently had reports from candidates that they have never received an email notification despite signing up for them. How is a notification triggered - is it automatic when a requisition is posted or does something need to be done by the recruiter? How are the "areas of interest" decided? I cannot see how a candidate would select these. I cannot find anything in any of the configuration or user guides about this. Grateful for any help even if this just