I doubt this was an accident. They can set up mail security to prevent this kind of thing from happening. More than one way to block this from occurring.
This is on par with Hillary Clinton mentioning the actual name of an undercover agent in Iran’s nuclear program on her home email server. What possible reason could she have. She could have referenced him in a dozen ways without using his actual name. My theory is her server was a way to get information to agents who were paying her for it.
The guy was executed. While Comey forgave it as extremely reckless nothing happened to her. She and any Democrat would barbecue children and eat them on TV and nothing would be done about it. Oh, she also sold US uranium to another donor.
It’s probably how the Obama administration, on the down low of course, with full deniability, timely gave bin Ladin’s men the information they needed to take Seal Team Six’s troop transport helicopter out of the sky.
Which is probably why it is not actually happening.
It was no accident.