It's a journalist's job to get the internal story, even if that requires exploiting various forms of petite disloyalty. Also, a rah-rah message this generic was written with the expectation it would be leaked.

And, Swisher as a journalist would likely expect (and perhaps even respect) if her own correspondents leaked her own emails, if and when it could advance a story of industrywide interest. Journalists aren't especially thin-skinned, naive, or hypocritical about such things.