I actually have a random string of characters at the end of my LinkedIn profile to find those good recruiters. It states very clearly that I will not respond to

I actually have a random string of characters at the end of my LinkedIn profile to find those good recruiters. It states very clearly that I will not respond to any recruiter unless that string is in either their LinkedIn or email outreach. I get about 6 recruiters a year that actually read my profile to the end and follow the instruction. For those recruiters I always engage with a thankful response of their due diligence regardless of whether or not I'm interested. I've made a few great acquaintances over the years of great recruiters this way.