(AP) – Education Secretary Betsy DeVos has sometimes used her personal email accounts for government business and has not always properly saved the messages, according to an internal investigation released Monday.

The agency’s Office of Inspector General, which was investigating at the request of House Democrats, said it searched the department’s email system and found a “limited” number of messages to or from DeVos’ personal accounts. In total, it said there were “fewer than 100” emails linked to four personal accounts.

Most of the emails were from the first six months of 2017, soon after DeVos took office, and most were from a single person, the inquiry found. The person, who was not identified in the report, was writing to recommend candidates for agency jobs. Other emails were from people who congratulated DeVos on her confirmation or offered other job advice.

In total, investigators said they identified six emails sent by DeVos on private accounts, including five that involved official agency business. The inquiry concluded that there was no evidence of “active or extensive” use of DeVos’ personal accounts.

The secretary’s office told investigators it was taking “additional steps to identify and preserve” emails in her personal accounts. A department spokeswoman declined to comment for this story.

Under department rules, employees are forbidden from using personal emails for government business except in rare circumstances when their work accounts are unavailable. In those cases, employees are required to forward the messages to their work accounts within 20 days. But in DeVos’ case, the report said, that never happened.