A new e-mail validation system in the Senate will verify that all e-mails sent from Senate.gov addresses originate from legitimate — not "cloaked" — servers, the sergeant at arms announced Wednesday.

The system was implemented this week after news outlets received a series of false press releases saying that Sens. Patrick LeahyPatrick Joseph LeahyShutdown would affect 800K federal workers, Senate Dems say Oval Office clash ups chances of shutdown Senators dumbfounded by Trump vow to shut down government MORE (D-Vt.), Dianne FeinsteinDianne Emiel FeinsteinSenate Dems urge Trump to continue nuclear arms control negotiations after treaty suspension Senate Intel leaders ask judge not to jail former aide amid leak investigation Dems demand Pompeo brief Congress on whether he discussed Assange with Ecuadorian official MORE (D-Calif.), Frank Lautenberg (D-N.J.) and Harry ReidHarry Mason ReidManchin’s likely senior role on key energy panel rankles progressives Water wars won’t be won on a battlefield Poll finds most Americans and most women don’t want Pelosi as Speaker MORE (D-Nev.) had died of cancer in their homes. 

Known as "sender policy framework" (SPF), the system “allows recipients’ e-mail systems to automatically check inbound messages to validate that they originated from a server authorized for the sender’s e-mail address,” according to an e-mail from the sergeant at arms to Senate administrators. 

The e-mail recommended that news media outlets use the SPF system to verify that e-mails received from Senate.gov addresses are legitimate. 

The four hoax e-mails — now under investigation by the U.S. Capitol Police — were modeled to look like blasts from the senators’ offices.