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High Quality Content by WIKIPEDIA articles! Vouch by Reference provides a mechanism for some entity (an email certification provider) to tell a receiving mail system about the reputation of a sender of email. It is intended to become a standard way for email certification providers to vouch for outbound email sent by others, and is described in . VBR information can be used by a Mail Transfer Agent, a Mail Delivery Agent or by an email client.A customer of a VBR Email Certification Provider signs their message using DomainKeys Identified Mail, including within the list of signed headers a VBR-Info: header field. The sender may also use Sender Policy Framework, but only the receiving MTA can reliably verify a domain name with this technique. The VBR-Info: header field contains