So he says he's disclosing everything that's related to government business, but the truth is that no one else has any way to confirm it:
SourceFormer Florida Gov. Jeb Bush, a likely Republican presidential candidate, primarily used a personal email account on his own computer server when he was in office from 1999 to 2007. In December, he posted online hundreds of thousands of emails from both the private and government accounts. Mr. Bush’s spokeswoman said that emails from the private account unrelated to government business weren’t turned over to the state or preserved. […]
But much like with Mrs. Clinton, the decision over which emails should be considered official and which remain private was made by Mr. Bush. It is unclear how many emails Mr. Bush withheld because he deemed them unrelated to state business.