"...the use of private emails and pseudonyms appeared to be a frequent pattern of behavior in the Obama administration [in violation of federal record-keeping laws, as well as likely circumventing Freedom of Information Act requests]. In addition to Biden and Kerry, Clinton notoriously rerouted her email to private, unsecured server that she maintained possession of at her home.

"The server, which revealed several emails with classified markings, despite Clinton’s efforts to destroy the evidence, was believed to have been compromised by the Chinese."
 https://headlineusa.com/whistleblower-corrupt-obama-scandal-free/#:~:text=the%20use%20of,by%20the%20Chinese.