The newly discovered account, first reported by Politico on Monday, comes as the White House is already looking at two private accounts connected to the couple. A full review of compliance by all White House staff and the usage of private email for official business is also underway.
Sources tell ABC News that the email account is part of a domain that Kushner established in December, called “ijkfamily.com.”
The White House counsel’s office is still in the initial phases of reviewing these accounts, sources say, adding that so far it appears this third account was used for scheduling purposes and was connected to both support staff inside the White House and the couple's household staff.
On Monday night, White House press secretary Sarah Sanders released a statement on the matter: “The White House instructs staff to fully comply with the Presidential Records Act and applicable guidelines for work-related communications. In light of recent congressional inquiries, we have briefed staff on the need to preserve records and working to ensure compliance,” she said.
An attorney for Kushner has not yet responded to a request for comment by ABC News.
ABC News' Jordyn Phelps contributed to this report.