No. I had never seen login.gov until you sent that link. That seems to be a type of single sign-on system that allows users to reduce the number of separate user IDs/passwords that they need when logging into participating web sites.
I was referring to email. Government employees, elected officials and, in some cases, volunteers are provided with a government email account. They are instructed to use that account for anything that involves government business.
Just as the financial industry requires that all messages be traceable, nearly all government emails (with exceptions for things like personnel matters, litigation, contract negotiations and the like) are considered public records and, if a member of the public puts in a request for copies of those emails they must be provided. There is also the need to produce emails for legal discovery, which is all too common in the government space.
If someone uses their personal account (GMAIL, AOL, YAHOO, etc.) that will often prevent messages from being properly searched and produced to fulfill a public records (or legal discovery) request.
