In 2013 the FBI took the encrypted email service Lavabit to court to force it to turn over the encryption keys that would allow the FBI to read emails on the service. Although Lavabit did ultimately provide the keys, they simultaneously shut down the service. It had been thought for some time that Edward Snowden had an account on the service and that his account was the target of the Feds, but that was unconfirmed until now.

On Thursday, 560 pages of sealed documents related to the case were released. They were heavily redacted in an apparent attempt to continue covering up what the the FBI was looking for, but they missed one item: a single reference to "Ed_Snowden@lavabit.com".

Article:
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Snowden WAS the Feds' quarry in Lavabit case, redaction blunder reveals
One tiny little reference missed in massive censoring effort
17 Mar 2016 - by Kieren McCarthy
http://www.theregister.co.uk/2016/03/17/feds_did_target_snowden_in_lavabit_case/
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The redaction fail: