Q. What should a good follow-up email to an interviewer include?
A. Assuming you've already thanked the interviewer via email, you can follow up by saying, "Dear XYZ, I hope this email finds you well. Just wanted to follow up with you regarding next steps. I enjoyed meeting with you last week and look forward to learning more about the position."
The goal is three-fold: To stay top of mind, to find out about next steps and then to show continued interest in the position.
It's always a good idea during the interview to tell the recruiter or hiring manager you plan on following up. In fact, I used to encourage my candidates to reach out to me if they hadn't heard back. If I didn't reach out to them, it wasn't because I wasn't interested in offering them the job—it was because I was juggling close to 150 candidates. Following up every 10 days to two weeks is a good rule of thumb.
Source: https://www.monster.com/career-advice/article/follow-up-email-job-interview-ask-Vicki-quora-0816