One of the top aides for Fauci admitted that Fauci and he used private email addresses to do government business. He even admitted ways he would use to avoid detection from FOIA.
https://www.nbcmontana.com/news/nation-world/fauci-advisor-b...
https://oversight.house.gov/release/new-covid-select-memo-de...
https://thehill.com/video/top-fauci-aide-david-morens-caught...