You might be interested to note that Hillary Clinton isn't the only one to have a bit of an email scandal on her hands - though education's versions aren't nearly as prominent as those the presumptive Democratic nominee faces currently (and are, frankly, not as recent as I'd like):
This Washington Post article (Group Opposed to Vouchers Cites Shortcomings) includes an embarrassing email from then-Bush Administration appointee Nina Rees about then-Senator Arlen Specter ("while I hate the guy, we need to be nice to him I'm told."
This AP/ USA Today story (Bush reading program beset by favoritism, mismanagement) included embarrassing emails from Reading First director Chris Doherty (also under Bush) expressing disdain for "whole language" developers: "They are trying to crash our party and we need to beat the (expletive deleted) out of them in front of all the other would-be party crashers who are standing on the front lawn waiting to see how we welcome these dirtbags."
Then there's the alleged scandal between an education reporter and Miami's Carvalho, summarized in the Miami New Times (Carvalho's Liaison): "The emails document discussions the pair had about her coverage of Miami-Dade Public Schools, as well as some sexually explicit banter."
I'm sure there are others -- I can think of at least one more off the top of my head -- but I'd love to hear more from you, dear reader.
No, the USDE notifying TFA that it was the subject of a FOIA request doesn't count. Not for ideological reasons, but just because it isn't really all that scandalous.