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 LeahyDemocrats criticize FBI's handling of tip line in Kavanaugh investigation Lawmakers spend more on personal security in wake of insurrection Senate unanimously passes bill to strengthen crime victims fund MORE (D-Vt.), Dianne FeinsteinDianne Emiel FeinsteinBiden signs bill to bolster crime victims fund Stripping opportunity from DC's children Progressive groups ask for town hall with Feinstein to talk filibuster MORE (D-Calif.), Frank Lautenberg (D-N.J.) and Harry ReidHarry Mason ReidSenate hopefuls embrace nuking filibuster Biden fails to break GOP 'fever' Nevada governor signs law making state first presidential primary 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. 

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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.