I've got on the mailing list of a London recruiter who have been spamming me for over two years. They run under at least two company names, and haven't stopped e-mailing me though they've told me they would do so twice.

They have a REC (UK trade body for recruiters) logo on their website but when I complained to REC, I was told they weren't a member, so there was nothing they can do (other than ask them to take the logo down).

I've taken to replying "Hello [name]" to each message but I only got one reply before that stopped getting results.

Still nothing I can do. What do you do when you are on the mailing list of a cowboy?