[newnewpdro]

> You should write every email as if it were public, because it's entirely likely that it will be. They can be forwarded, made public through legal discovery, or exposed in a data breach (eg. Sony/North Korea).

None of these are unique to email.

This is the attitude one should take for any electronic form of communication. Even old-fashioned ink on paper letters of significance have made it into the public record for all to see.