New e-mails procured by a government transparency advocacy group show that the president’s daughter, Ivanka Trump, continued to use a personal e-mail account even after she joined her father’s administration beginning in March 2017 until at least July 2017.

In e-mails published Thursday by American Oversight, which obtained the materials through a Freedom of Information Act (FOIA) request, Trump’s e-mail address is fully redacted under a (b)(6) exemption, which is the portion of the FOIA law that protects government officials from a "clearly unwarranted invasion of personal privacy."

Last month, American Oversight revealed in September that Trump, who serves as an official advisor to the president, was using a non-government e-mail account.

As Ars noted in September, Trump called his rival Hillary Clinton “Crooked Hillary” during the 2016 presidential campaign and afterward because she used private e-mail to conduct government affairs when she was secretary of state. The Justice Department did not press charges against Clinton, although Trump vowed to if he was elected.

Typically, White House official addresses would be @whitehouse.gov or @who.eop.gov (Executive Office of the President) and would not have been withheld as these were. Trump may still be using her @ijkfamily.com address, whose MX records still point to a Trump Organization server

"Those redactions and the unusual formatting makes it appear that she is not using a government account," Mike Gwin, American Oversight’s deputy communications director, e-mailed Ars.

"As you may notice, any White House address includes the notations WHO/EOP (shorthand for White House Office/Executive Office of the President)—including the email address used by her husband and other senior officials. Those accounts also include a firstname/lastname notation next to the address. Her emails have neither."

An unnamed spokesperson told Newsweek in September 2017 that Trump used her personal account prior to officially joining the White House and became a federal employee "to ensure that she would have access to government-issued communications devices and receive an official email account to protect government records."

Neither the White House nor the Trump Organization immediately responded to Ars’ request for comment.