http://www.deadmansswitch.net/about/
"Since this service is provided free of charge, it comes without any warranty, neither express nor implied (even the actual sending of the messages is not guaranteed, but we'll do our best)."
"Since this service is provided free of charge, it comes without any warranty, neither express nor implied (even the actual sending of the messages is not guaranteed, but we'll do our best)."
side note: I wonder if they are relying on two-form viral growth :).