Does the new batch of previously undisclosed State Department emails prove that big-money donors to the Bill, Hillary & Chelsea Clinton Foundation got special favors from Mrs. Clinton while she was secretary of state?

Not so far, but that the question arises yet again points to a need for major changes at the foundation now, before the November election.

Bill Clinton created the foundation in 2001 as a vehicle to fund his presidential library. He and his supporters have since raised more than $2 billion and pioneered initiatives ranging from fostering female-owned businesses in Haiti to lowering the cost of H.I.V./AIDS drugs in Africa. As the enterprise sprawled from water treatment to education to climate change, all three Clintons got involved, along with their network of longtime political advisers, former administration officials and business partners.

When Mrs. Clinton became secretary of state, the Obama administration tried to draw a line between the foundation, particularly its foreign-government sponsors, and her role. The new emails underscore that this effort was at best partly successful. “Pay-to-play” charges by Donald Trump have not been proved. But the emails and previous reporting suggest Mr. Trump has reason to say that while Mrs. Clinton was secretary, it was hard to tell where the foundation ended and the State Department began.