Since there is no legal expectation of privacy for emails stored on a corporate server, I would suspect that the same laws would apply to taxpayer paid-for government servers:
http://www.employmentlawdaily.com/index.php/2011/11/24/employees-have-no-reasonable-expectation-to-privacy-for-materials-viewed-or-stored-on-employer-owned-computers-or-servers/
And this is excerpted from the item below:
Government Employees and Email
Government employees have even less privacy than the little privacy a typical employee in the private sector may have. Under various public records acts and the Freedom of Information Act (FOIA), the public can gain access to almost anything a government employee writes down. Also, due to the nature of their job, courts are typically unwilling to find that government employees had a reasonable right to privacy in the first place.
http://consumer.findlaw.com/online-scams/email-privacy-concerns.html
OCU
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