Comment A hazard for us all (Score 1) 16
If a person or persons can demonstrate that they have unfettered access to your private communications they are in a good position to tell anyone else that you have things in there that might not in reality exist. They can assert that you have been talking dirty with minors, trading credit card numbers, selling secrets or conspiring to set a bomb. Anything they like, really.
Very hard to disprove. A negative case is the hardest to sustain.
Also, and this is what my users don't usually understand, a person who can read your correspondence can also write it. It wouldn't take much of an effort to insert the wrong sort of document into your outbox. Maybe some inappropriate photos? A badly worded appraisal of a colleague? Racial, sexual, political aspersions? Who knows?
It's been done in pre-internet days. Probably under way as we sit here.