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You shouldn't send an email from a computer that's associated with you if you don't want it to be tracked back to you. You don't want to hack the power plant from your house if you don't want them to follow the trail back and see your IP address.

"Exclusive: Edward Snowden on Cyber Warfare". Interview with James Bamford and Tim De Chant, www.pbs.org. January 8, 2015.
You shouldn't send an email from a computer that's associated with you if you don't want it to be tracked back to you. You don't want to hack the power plant from your house if you don't want them to follow the trail