Probably an inside job, not a hacker.
Agreed. The email dump appears to be the work of an insider with access to the mail servers.
This was definitely an inside job. If this were a random hacker, why did know where to go and what to look for. Someone on the inside knew what was going on. I would suspect that it was made to look like a hack job. On the other hand it may have been someone on the inside that did not have access and really did hack the computers from the outside but knew what he or she was looking for.
Yes, he or she is a hero.
This was definitely an inside job. If this were a random hacker, why did know where to go and what to look for. Someone on the inside knew what was going on. I would suspect that it was made to look like a hack job. On the other hand it may have been someone on the inside that did not have access and really did hack the computers from the outside but knew what he or she was looking for.
Yes, he or she is a hero.