I've worked at two places that did this. One place was run with an iron fist by the meanest physicist on the planet, a guy who eats nails for breakfast and al

I've worked at two places that did this. One place was run with an iron fist by the meanest physicist on the planet, a guy who eats nails for breakfast and always asks the toughest question at the seminar. His attitude was "delete 'em all and let got sort 'em out" The other place was my own personal network of websites, where I was trying to keep spam-harvesting robots from getting my email address. I had a process that had several steps to protect the page that had my address on it, one of which was a 'tripwire' which would instantly block any stupid robot that followed one of the hidden link. I can say that I've gone for years without getting any email complains about difficulties reading my email address ;-)