I would translate thusly: “I never sent nor received any classified information via email because I previously instructed my staff to strip any and all designations indicating a security classification.” Plausible deniability, people, ‘cept in this case, she is now busted.
That's like sending a crew into a bank to tie up the bank employees and impersonate them instead of robbing the bank. Then you walk in go up to a cashier and cash a check for everything in the vault.
"All I did was cash a check!" "It's the bank's responsibility to validate withdrawals." "I'm not an expert on bank employees, I didn't know they weren't real."