Surely we are currently clean on OPSEC. There couldn't be any precedent for government officials using private email servers for confidential information!
https://www.npr.org/2016/09/08/493133413/colin-powells-ways-...
Of course that pales in comparison with the practices of the GWB White House:
https://www.newsweek.com/2016/09/23/george-w-bush-white-hous...