Made worse by the fact that non-technical people DO make such errors with some frequency. I don't know how many times I've seen someone's email address as "www.

Made worse by the fact that non-technical people DO make such errors with some frequency. I don't know how many times I've seen someone's email address as "www.joe@example.com" or "joe@example," even on printed material that you'd hope people would carefully proof-read.