The last version of the code, which I kept running for over 6+ months, continued replying with things like “Thanks <Recruiter’s Name>. I’m interested.” —or— “Thanks <Recruiter’s Name>. I’m not interested, but I appreciate the invitation.” After comparing the success rate of my interviews with the length of my initial replies, I realized that short messages resulted in better leads.
I dare to say that it never matters if the recruiter is targeting you specifically or bombarding a long list of potential employees. They only need to know if you are interested or not, so writing long emails to accept or decline their invitations is usually a waste of time, for you and for them. If you are interested, say so, and they will quickly set up a pre-screening call to tell you more about the company, the role, the team, compensation package, or whatever you want to know.
If you are not interested, most recruiters will appreciate a simple “not interested. thanks.” and move on.