By the time Swartz was arrested and identified, it was out of MIT's hands.
Even my grandparents have more coherent email addresses, and they don't even have a whole domain effectively for themselves.
How many email addy's u got?
For an industry that claims to be a pure meritocracy I'd really love it if it were practiced more with regard to schools.
The password reset email [3] you seem to obliquely reference was actually a phishing scam that appears to have led to this hack. Note the fake bit.ly reset link. Finally, we know these haven't been tampered with because we can validate the DKIM signatures. [4]
[1] CNN's saying "it's illegal" - https://www.youtube.com/watch?v=_X16_KzX1vE
[2] Lawyer saying it's legal - https://popehat.com/2016/10/17/no-it-is-not-illegal-to-read-...
[3] The spear phishing email that busted them - https://wikileaks.org/podesta-emails/emailid/34899
[4] Erratasec discussing DKIM validation - http://blog.erratasec.com/2016/10/yes-we-can-validate-wikile...
There definitely is sensitive information in there, but to answer your question: I'm sure some of it is being screened, but obviously not all of it.