The Authenticated Received Chain (ARC) protocol allows Internet Mail Handlers to attach assertions of message authentication state to individual messages. As messages traverse ARC-enabled Internet Mail Handlers, additional ARC assertions can be attached to messages to form ordered sets of ARC assertions that represent authentication state along each step of message handling paths. Valimail and Google are two of the editors of the ARC specification. Together, we are working to build ARC as a supplemental but crucial piece of the current DMARC standard.
DomainKeys Identified Mail (DKIM CRypto UPdate) working group is chartered to update DomainKeys Identified Mail (DKIM, RFC 6376) to handle more modern cryptographic algorithms and key sizes. As shepherds of DCRUP (RFC 8301), Valimail played a key role in the publishing and availability of this standard. We advocate for cryptographic updates that make DKIM stronger.