eh? this has been a feature of xerox's for over 3 years?
we've got xerox printers in our office that have had support for printing via email since we got them - in 2007. They require no connection to the printer either, it just checks an email address regularly for print jobs.
seems to be a bit of a flaw with the article ?
also, there is no problem with spam, as you can set a password and limit it to certain users using it.