Everyone in Gov’t power has been doing this since Bill Clinton was in office. It is no suprise. This way they can hide all their correspondence and no one will be the wiser. If all else fails they delete the entire account.
Recall when Clinton left office their were several pending FOIA cases where it was ordered to keep everything in the system. While Bush was being sidelined with the election recount and then 9/11 the systems were all shut down and deleted. When Judge Clayton had the matter before him he declared it “moot” due to the length of time. Dems skated as they have on every case since.
Use of an Alias is deceptive and most likely used for fraudulent purposes. No one will ever know if nobody investigates. I believe Mr.’s Comey and Mueller are fully aware of these practices.