An email from Bryan Pagliano to Cheryl Mills, Clinton’s chief of staff, on this day that will later be made public shows that Pagliano sometimes uses the email address firstname.lastname@example.org for work matters. Pagliano is a State Department employee at the time, but he also is managing Clinton’s private email server. In the email, he tells Mills, “Sent a reply from my [redacted] address, but delivery tends to be delayed going to state.gov addresses.” This shows he uses a government email address for work as well. (US Department of State, 1/15/2016)
The hillaryclinton.com domain was used for people working for Clinton’s 2008 presidential campaign, as Pagliano did. Apparently that domain was kept operational long after the campaign ended.