Here is an article you might find helpful in understanding the email systems that the government uses.
http://www.govexec.com/technology/2016/07/how-did-classified-information-get-those-hillary-clinton-emails/129979/
The HANDLING CLASSIFIED INFORMATION portion really explains it well.
snip -
Media sometimes erroneously refer to Clinton as having shared classified documents. This is not something she is accused of. It is extremely difficult to share a classified document electronically over email. Most government agencies, including the State Department, maintain separate systems precisely to make it all but impossible to electronically pass information between classified and unclassified systems.
One cannot simply view a document on a classified network and email it to someone on an unclassified system even within the same agency. This is partly why Clinton and her aides say so assuredly that they did not knowingly email classified materials.
another snip -
The fact is government officials inadvertently send classified details over unclassified email systems all the time. Considering the amount of information dealt with on a daily basis, it is inevitable. Classified details are accidentally revealed in casual conversations and media interviews. We may not hear about it because it’s not in the interviewee’s interest to point that out after the fact.
A colleague and former CIA analyst tells his students he would never knowingly but almost certainly will inadvertently relate in the classroom a tidbit that is classified. The classic example is when Senator David Boren accidentally revealed the name of a clandestine CIA agent. Boren at the time was no less than chairman of the Senate Select Committee on Intelligence.
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