Christopher Chaney, 35, of Jacksonville, was arrested on Wednesday on charges stemming from a year-long probe known as Operation Hackerazzi.
He is accused of hacking into more than 50 email accounts.
If he could so can many others. I wish we helped each other to be more secure.Mr Chaney is charged with hacking Google, Apple and Yahoo email accounts.
He set up each account to forward a copy of every email received to himself, according to the charge sheet issues by a Los Angeles grand jury.
He faces up to 121 years in prison if convicted on all 26 charges, including accessing and damaging computers, wire tapping and identity theft.