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 LeahyCongress should build on the momentum from spending bill Overnight Tech: Zuckerberg grilled by lawmakers over data scandal | What we learned from marathon hearing | Facebook hit with class action lawsuit | Twitter endorses political ad disclosure bill | Uber buys bike share Overnight Cybersecurity: Zuckerberg faces grilling in marathon hearing | What we learned from Facebook chief | Dems press Ryan to help get Russia hacking records | Top Trump security adviser resigning MORE (D-Vt.), Dianne FeinsteinDianne Emiel FeinsteinTrump’s CIA pick facing brutal confirmation fight This week: Senate barrels toward showdown over Pompeo Sunday Shows Preview: Emmanuel Macron talks ahead of state dinner MORE (D-Calif.), Frank Lautenberg (D-N.J.) and Harry ReidHarry Mason ReidLobbying world Senators fume over fight to change rules for Trump's nominees After Dems stood against Pompeo, Senate’s confirmation process needs a revamp 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.