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 LeahyMcCabe oversaw criminal probe into Sessions over testimony on Russian contacts: report Graham calls for Senate Judiciary hearing on McCabe firing McCabe firing roils Washington MORE (D-Vt.), Dianne FeinsteinDianne Emiel FeinsteinFeinstein, Harris call for probe of ICE after employee resigns Jeh Johnson: Media focused on 'Access Hollywood' tape instead of Russian meddling ahead of election What’s genius for Obama is scandal when it comes to Trump MORE (D-Calif.), Frank Lautenberg (D-N.J.) and Harry ReidHarry Mason ReidGOP pushes to change Senate rules for Trump Trump presses GOP to change Senate rules Only thing Defense’s UFO probe proves is power of political favors 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.