Maybe once every 2 or 3 months I get an email from a recruiter, and it gets immediately marked as spam. Far more frequently though, I get emails from people as

Maybe once every 2 or 3 months I get an email from a recruiter, and it gets immediately marked as spam. Far more frequently though, I get emails from people asking interesting questions either about one of my projects or about something they're doing that is similar to one of my projects. I consider the (very low) cost of recruiter spam to be a price worth paying to enable those other interactions.