WASHINGTON — At least six of President Trump’s closest advisers occasionally used private email addresses to discuss White House matters, current and former officials said on Monday.

The disclosures came a day after news surfaced that Jared Kushner, the president’s son-in-law and adviser, used a private email account to send or receive about 100 work-related emails during the administration’s first seven months. But Mr. Kushner was not alone. Stephen K. Bannon, the former chief White House strategist, and Reince Priebus, the former chief of staff, also occasionally used private email addresses. Other advisers, including Gary D. Cohn and Stephen Miller, sent or received at least a few emails on personal accounts, officials said.

Ivanka Trump, the president’s elder daughter, who is married to Mr. Kushner, used a private account when she acted as an unpaid adviser in the first months of the administration, Newsweek reported Monday. Administration officials acknowledged that she also occasionally did so when she formally became a White House adviser. The officials spoke on the condition of anonymity because they were not authorized to discuss the matter with reporters.

Officials are supposed to use government emails for their official duties so their conversations are available to the public and those conducting oversight. But it is not illegal for White House officials to use private email accounts as long as they forward work-related messages to their work accounts so they can be preserved.