As most recruiters know, passive candidates can be some of the most high-quality candidates in your talent pipeline. However, it can be challenging to get them interested in your company and role (as they are not actively looking to leave their current role). While tools like LinkedIn Recruiter, Upwork, Stack Overflow, and AngelList can be helpful in finding passive candidates, you still need to reach out to them in an engaging way.
A good email open rate on LinkedIn Recruiter for InMail messages is around 20%. This is the email template I use that has consistently generated a 40-46% response rate in my LinkedIn Recruiter InMail messages:
Subject: Would you be interested in this?