Not that Gowdy needs my advice, but shouldn’t his investigators depose all of Hillary’s top aides by asking about their own “private” email accounts and whether they ever used them to conduct official State Dept. business with Hillary? Did any of them have an account on Hillary’s domain?
Some of those folks are civil service and have a lot to lose by lying (not everybody can get a campaign position as a payoff for silence).
Oftentimes such schemes fail when somebody slips up and reveals their hidden method - in this case, emailing from their secret email address to someone on their guv account. Thus, Gowdy needs to require aides to provide a complete list of private addresses.
Apparently the MX (Mail Exchange) DNS records for her domain point to MX logic, which means she's using MX Logic mail servers as a relay. While they won't have the content of the emails, the logs from those servers will contain a record of all the emails to and from her mail server (sender, recipient, and source IP addresses), and those logs are not under her control.
Blumenthal while not a government employee (apparently from reports I read)may have had email exchanges that involved State Department or other Government security information over that private non-secure account.
Hillary needs to account for such illegal activity.
Yes, that's an interesting observation. Anybody sending her email from their official .gov acct would leave an audit trail showing that official business was conducted with a private account. So everybody sending her email to that private account would have needed to have done so from THEIR OWN private account.