One caution--they can be really sneaky about where your car is to say you're "running" the red light. To be at all fair, any city that starts this should publicize how the cameras work, and what the tolerances are.
Tickets by mail are pretty common in Brazil. After 6-8 weeks down there, someone I knew found out he had received five tickets in Florianopolis for "running a red light." It turned out that if the nose of the car was a few inches over the white stop line, a photo was taken and a ticket issued. Another irony of that situation was that the active ticketing lights were published every week in the newspapers, so most of the folks caught were tourists. I think publishing which cameras are on is a little too much information, but people should at least have warning of how far over the line or how long past the red light they will be ticketed.
Oh, I agree 100%. The idea is not to "trick" people or give them a ticket on a technicality. Tickets should be given as they would if a police officer were sitting there and witnessed the infraction. I would even go so far as to say that tickets should only be issued for flagrant, obvious infractions, such as the car being caught in the middle of the intersection with the light red. None of that "bumper over the white line". And I would add that such a system should not be used if it can't tell the difference.