Updated

The Obama administration on Tuesday defended officials' use of private email accounts to conduct government business and denied that they were in any way "secret" -- though the public faces hurdles in gaining access to that information.

The Associated Press reported earlier that some of President Obama's political appointees were using "secret" government emails accounts -- a situation that could complicate their responsibility to turn over emails under public records requests and congressional inquiries.

One of those officials, Health and Human Services Secretary Kathleen Sebelius, denied that her account was "secret" when asked by Fox News about the report.

"There's a public email and a private email," she said, adding that anyone could formally request to have access to that information.

Sebelius explained that she needed the alternative account to deal with the influx of messages.

More On This...

    "27-28,000 come into the public email, about 400 come into the private email. It's just a management issue. I can't possibly answer or screen all of them, and I want people to get timely answers," she said.

    White House Press Secretary Jay Carney gave a similar explanation, saying the practice is "consistent with prior administrations."

    "Having alternate email addresses for Cabinet secretaries and other high-profile official makes eminent sense, as much as it does for columnists for example, of major publications who provide email addresses for their readers, but have alternative work email addresses," he said.

    Carney said all their email accounts, public and otherwise, were subject to congressional oversight and requests by citizens under the U.S. Freedom of Information Act.

    "There's nothing secret," Carney said.

    But if it's not secret, it's certainly difficult to find.

    The AP reviewed hundreds of pages of government emails released under the federal open records law and couldn't independently find instances when material from any of the secret accounts it identified was turned over. Congressional oversight committees told the AP they were unfamiliar with the few nonpublic government addresses that AP identified so far, including one for Sebelius.

    The White House said the practice was also used by previous administrations, but its scale across the government remains a mystery: Most federal 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 such addresses following last year's disclosures that former chiefs at the Environmental Protection Agency had used separate email accounts at work. The practice is separate from officials who use personal, nongovernment email accounts for work, which generally is discouraged due to laws requiring that most federal records be preserved.

    Having separate accounts could put an agency in a difficult spot when it is compelled to search for and release emails as part of congressional or internal investigations, civil lawsuits and public records requests. That's 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 try 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 nonpublic 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 nonpublic accounts would always be searched in response to official requests and the records would be provided as necessary.

    In its review, the AP found only one instance of a secret address being published: 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 nonpublic address for Seth D. Harris, now 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 Sebelius.

    Ten agencies have not yet turned over lists of email addresses, including the Environmental Protection Agency and the departments of Defense, 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.

    Carney would not say whether White House officials also use secret accounts, noting that the president's staff, like Congress, is exempt from turning over materials under the open records law. But Carney said that early in his tenure as press secretary, after his email address had been announced publicly, Carney changed his address to avoid being inundated by emails and spam.

    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@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@hhs.gov.

    At least two other senior HHS officials -- 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 had secret government email addresses, according to the records obtained by the AP.

    A spokesman for Cohen, Brian Cook, said the nonpublic address that HHS listed in its records -- Gary.Cohen1@cms.hhs.gov -- was created after Cohen rejoined the department in August 2012 following a brief absence and all emails now are directed to his public government email account. Cook called the suggestion that Cohen ever had a secret account "news to everyone, including Gary."

    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.

    The Labor Department initially asked the AP to pay slightly more than $1.03 million when the AP asked for email addresses of political appointees there. It said it needed to pull 2,236 computer backup tapes from its archives and pay 50 people to pore over old records. Those costs included three weeks to identify tapes and ship them to a vendor, and pay each person $2,500 for nearly a month's work. But under the department's own FOIA rules -- which it cited in its letter to the AP -- it is prohibited from charging news organizations any costs except for photocopies after the first 100 pages. The department said it would take 14 weeks to find the emails if the AP had paid the money.

    Fillichio later acknowledged that the $1.03 million bill was a mistake and provided the AP with email addresses for the agency's Senate-confirmed appointees, including three addresses for Harris. His secret address was harris.sd@dol.gov. His other accounts were one for use with labor employees and the public, and another to send mass emails to the entire Labor Department, outside groups and the public. The Labor Department said it did not object to the AP publishing any of Harris' email addresses.

    Late last year, the EPA's critics -- including Republicans in Congress -- accused former EPA Administrator Lisa Jackson of using an email account under the name "Richard Windsor" to sidestep disclosure rules. The EPA said emails Jackson sent using her Windsor alias were turned over under open records requests. The agency's inspector general is investigating the use of such accounts, after being asked to do so by Congress.

    An EPA spokeswoman described Jackson's alternate email address as "an everyday, working email account of the administrator to communicate with staff and other government officials." It was later determined that Jackson also used the email address to correspond sometimes with environmentalists outside government and at least in some cases did not correct a misperception among outsiders they were corresponding with a government employee named Richard Windsor.

    Although the EPA's inspector general is investigating the agency's use of secret email accounts, it is not reviewing whether emails from Jackson's secret account were released as required under the Freedom of Information Act.

    The Associated Press contributed to this report.