Best practice job alerts for not registered users

Hi,

I’m building a job listing website. I’m having a custom post type, some filtering options (fulltime/parttime, location, etc). Right now I’m trying to build a job alert function. For logged in users this is no problem, but I’m having trouble with the job alert for not registered users. Do you have any tips for me to realize this? I’ve looked into filter -> rss -> email but this seemed unnecessary complicated.

Thanks in advance!

Sander