ARC has finally arrived on Cisco/Ironport
From the latest AsyncOS release notes:
Authenticated Received Chain (ARC) Support
Secure Email Cloud Gateway now supports Authenticated Received Chain (ARC). This feature ensures that legitimate emails can pass security checks even after being modified by intermediaries, such as mailing lists or forwarding services.
Core Functionality:
• ARC Sealing: Acts as a "sealer," appending authentication results and digital signatures to outgoing messages to preserve the chain of trust.
• ARC Verification: Validates existing chains on incoming messages. By referencing a list of trusted intermediaries, the system verifies the integrity of the message's history.
• Policy Override: Allows for the delivery of messages that would otherwise be blocked or quarantined by security policies, provided they possess a valid authentication chain.
• System Visibility: Provides clear status indicators within email headers. Comprehensive details are also integrated into the DMARC Verification Report and Message Tracking.
Anyone given it a spin yet?