Attorney Isabel Del Vecchio had been sparring with opposing counsel in a tough personal injury case when an email she wasn’t supposed to see infuriated her.

Del Vecchio had been a lawyer for about eight years. She knew there was tension between her and Michael Carreira, an attorney with Meehan, Roberts, Turret and Rosenbaum, which represents Liberty Mutual. But she didn’t expect the allegation in the message Carreira thought he’d sent only to his adjuster in the case.