Résuméfox provides a quick way to send personalized emails to multiple candidates in one go. You can personalize the emails so that the candidates can be addressed by their real name instead of being addressed as something like “Hi Candidate”. Typically you would use this feature to check if the candidates are interested in a job that you have. You can also have attachments (typically your company profile and the job description) go with these emails.
You can keep multiple email templates ready which you can use to send out emails quickly.