Cloudmark Blog Bolstering Email Authentication with ARC and Email Security with MTA-STS

In the most recent release of Cloudmark Security Platform (CSP) for Email 5.7, Cloudmark's carrier-class email security gateway adds support for two emerging authentication and security protocol standards: Authenticated Received Chain (ARC, RFC 8617) and SMTP MTA Strict Transport Security (MTA-STS, RFC 8461). The ARC protocol addresses a difficulty in authenticating forwarded messages not addressed by other [...]