Online games separate your public handle from your login username (typically your email address). If someone wants to take over LazerBob, they have to first guess his username.
It's nowhere near sufficient by itself, but it cuts down on the noise dramatically.
Many email addresses should be considered sensitive, in that you want any attempt to talk to them to get close personal attention from several senior people. "hostmaster@fastmail.fm" should be changed to "hostmaster-9508gdgs42x@fastmail.fm" simply to reduce the amount of noise going to it. Don't publish it in your whois or on your blog; tell it only to your domain manager.
You can't count on it staying secret forever, of course.
It's nowhere near sufficient by itself, but it cuts down on the noise dramatically.
Many email addresses should be considered sensitive, in that you want any attempt to talk to them to get close personal attention from several senior people. "hostmaster@fastmail.fm" should be changed to "hostmaster-9508gdgs42x@fastmail.fm" simply to reduce the amount of noise going to it. Don't publish it in your whois or on your blog; tell it only to your domain manager.
You can't count on it staying secret forever, of course.