WASHINGTON (AP) - Some of President Barack Obama's political appointees, including the Cabinet secretary for the Health and Human Services Department, are using secret government email accounts they say are necessary to prevent their inboxes from being overwhelmed with unwanted messages, according to a review by The Associated Press.

The scope of using the secret accounts across government remains a mystery: Most U.S. agencies have failed to turn over lists of political appointees' email addresses, which the AP sought under the Freedom of Information Act more than three months ago. The Labor Department initially asked the AP to pay more than $1 million for its email addresses.

The AP asked for the addresses following last year's disclosures that the former administrator of the Environmental Protection Agency had used separate email accounts at work. The practice is separate from officials who use personal, non-government email accounts for work, which generally is discouraged - but often happens anyway - due to laws requiring that most federal records be preserved.

The secret email accounts complicate an agency's legal responsibilities to find and turn over emails in response to congressional or internal investigations, civil lawsuits or public records requests because employees assigned to compile such responses would necessarily need to know about the accounts to search them. Secret accounts also drive perceptions that government officials are trying to hide actions or decisions.

"What happens when that person doesn't work there anymore? He leaves and someone makes a request (to review emails) in two years," said Kel McClanahan, executive director of National Security Counselors, an open government group. "Who's going to know to search the other accounts? You would hope that agencies doing this would keep a list of aliases in a desk drawer, but you know that isn't happening."

Agencies where the AP so far has identified secret addresses, including the Labor Department and HHS, said maintaining non-public email accounts allows senior officials to keep separate their internal messages with agency employees from emails they exchange with the public. They also said public and non-public accounts are always searched in response to official requests and the records are provided as necessary.

The AP couldn't independently verify the practice. It searched hundreds of pages of government emails previously released under the open records law and found only one instance of a published email with a secret address: an email from Labor Department spokesman Carl Fillichio to 34 coworkers in 2010 was turned over to an advocacy group, Americans for Limited Government. It included as one recipient the non-public address for Seth D. Harris, currently the acting labor secretary, who maintains at least three separate email accounts.

Google can't find any reference on the Internet to the secret address for HHS Secretary Kathleen Sebelius. Congressional oversight committees told the AP they were unfamiliar with the non-public government addresses identified so far by the AP.

Ten agencies have not yet turned over lists of email addresses, including the Environmental Protection Agency; the Pentagon; and the departments of Veterans Affairs, Transportation, Treasury, Justice, Housing and Urban Development, Homeland Security, Commerce and Agriculture. All have said they are working on a response to the AP.

White House spokesman Eric Schultz declined to comment.

A Treasury Department spokeswoman, Marissa Hopkins Secreto, referred inquiries to the agency's FOIA office, which said its technology department was still searching for the email addresses. Other departments, including Homeland Security, did not respond to questions from the AP about the delays of nearly three months. The Pentagon said it may have an answer by later this summer.

The Health and Human Services Department initially turned over to the AP the email addresses for roughly 240 appointees - except none of the email accounts for Sebelius, even one for her already published on its website. After the AP objected, it turned over three of Sebelius' email addresses, including a secret one. It asked the AP not to publish the address, which it said she used to conduct day-to-day business at the department. Most of the 240 political appointees at HHS appeared to be using only public government accounts.

The AP decided to publish the secret address for Sebelius - KGS2(at)hhs.gov - over the government's objections because the secretary is a high-ranking civil servant who oversees not only major agencies like the Centers for Medicare and Medicaid Services but also the implementation of Obama's signature health care law. Her public email address is Kathleen.Sebelius(at)hhs.gov.

At least two other senior HHS officials - including Donald Berwick, former head of the Centers for Medicare and Medicaid Services, and Gary Cohen, a deputy administrator in charge of implementing health insurance reform - also have secret government email addresses, according to the records obtained by the AP.

The Interior Department gave the AP a list of about 100 government email addresses for political appointees who work there but none for the interior secretary at the time, Ken Salazar, who has since resigned. Spokeswoman Jessica Kershaw said Salazar maintained only one email address while serving as secretary but she would not disclose it. She said the AP should ask for it under the Freedom of Information Act, which would take months longer.

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