The employer is the company the job is with, the recruiter may be an agency placing jobs on behalf of the employer. In the
JobRoller admin settings you can determine if you wish to allow the recruiters registration type, which can give you a little more control over resume visibility.
There are no options to charge job seekers, but you can choose to allow free listings for employers. There is no setting for newsletters, however if a job seeker chooses to be alerted to new job listings there are settings for this within the theme. Thanks.