Simple...have had a security clearance for many years.
The instructions are ALWAYS the same....treat everything as if it’s classified. Err on the side of caution then you have NO issues
Private emails should be done at home
Right - but face to face you can look at someone’s badge to check their clearance. You can’t do that over e-mail.
How is proper clearance checked?
Concur. Official email is done on official systems, period. Anything marked classified is treated as such. Those with clearances should be able to recognize classified material, even when it isn’t marked.