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I'm wondering where some information came from in a message I got on my Mac laptop. Here's the message:
From john@leutenberg.horners.org
X-Original-To: john
Delivered-To: john@leutenberg.horners.org
From: john@leutenberg.horners.org (Cron Daemon)
To: john@leutenberg.horners.org
...
Where did it get the "john@leutenberg.horners.org" I know my username is john, and my computer is leutenberg, but where did it get the horners.org part?