and we know what grief that can cause
You mean all the spam and blatant extortion attemps that arrive as the result of LinkedIn being brached a number of times?
Fortunately, because I run my own mail server and firewall, I can use -variants of my base email address and customise them to individual services. Then, if I get spam to a particular variant addess I can blacklist that variant of the firewall and never see any traffic using that variant again.
And since I've yet so see a useful email from LinkedIn, dropping the linkedin variant into the blacklist lost nothing of value.