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The message modifications cause authentication to fail for other reasons (example, by removing attachments). After an admin adds a trusted ARC sealer in the Defender portal, Microsoft 365 uses the original email authentication information that the ARC sealer provides to validate the messages sent through the service into Microsoft 365.
This cmdlet is available only in the cloud-based service. Use the Set-ArcConfig cmdlet to modify the list of trusted Authenticated Received Chain (ARC) sealers that are configured in the cloud-based organization. For information about the parameter sets in the Syntax section below, see Exchange cmdlet syntax.
I have configured Trusted Arc Sealer For some reason I see different Authentication headers when recieve from other ms exhange and gmail. from ms - compauth=none reason=452 from gmail - compauth=pass…
With configured ARC sealers domain when recieve emails from other ms ...
The destination email system can identify the service as a trusted ARC sealer. ARC can then use the preserved email authentication information to validate the message.
DMARC checks for inbound mail might need help: If you use an email service that modifies messages in transit before delivery into Microsoft 365, you might be able to identify the service as a trusted ARC sealer. Trusted ARC sealers prevent modified messages from automatically failing DMARC checks.
