Dear Recruiter,
Thank you for contacting me. As you can see on my LinkedIn profile, I am not seeking a full time position at this time. While I would consider a FT position with a startup, I am not interested in working for a company with more than 100 people nor do I wish to relocate to San Francisco or the Bay Area suburbs.
If you are receiving this form letter, it's because your email to me contained one of the above conditions. While I appreciate that you reached out to me, I am not able to respond personally to all of the form recruiting letters I receive and so I hope this suffices.
Have a nice day and no I don't have any referrals for you either.
xoxo, me