The Mailbox Connector: Seeing the Email Traffic Standard DMARC Tools Cannot

A DMARC aggregate report is a list of sending sources and pass or fail counts. It is enough to see that mail is failing authentication, and short of enough to act. It names an IP address, not the marketing manager who signed up for the platform behind it. The detailed failure reports that carry more context are meant to fill that gap, but the major mailbox providers stopped sending them to protect the privacy of their users. The result is that a monitoring only tool sees the senders and misses the owners, which is the information you actually need to reach enforcement.

The Mailbox Connector is an administrator granted OAuth connection to Microsoft 365 or Google Workspace. It reads inbound message metadata to see which internal recipients receive mail from a given sending service, which points to the team that owns it. It does not analyze message content. Valimail authenticates senders with a deterministic, policy based model rather than AI or machine learning, so it never needs message bodies, attachments, or links. Access is delegated, scoped to the domains you connect, and revocable at any time by removing the Valimail application from Azure AD or Google Workspace.

Because the Connector reads headers and metadata rather than content, the authentication engine holds zero personal data, which aligns with what the Personal Information Protection Commission expects of customer communication in Japan. Valimail holds SOC 2 Type 2, is the only FedRAMP authorized DMARC vendor, and is GDPR and CCPA aligned. For a Japanese enterprise or a regulated buyer, this is the combination that lets a security team gain full sending visibility without taking on a new data protection liability.

The Mailbox Connector works with Microsoft 365 and Google Workspace. Subsidiaries or domains that run mail on premises need a separate approach, because there is no cloud mailbox to connect. In a typical Japanese group structure with a mix of Microsoft 365, Google Workspace, and self hosted mail, the Connector covers the cloud hosted majority and the remaining domains are handled through the standard aggregate report and sender inventory workflow. Naming the constraint honestly matters, because it sets the right expectation for a group wide rollout.

Once the recipient side is visible, the enforcement path becomes safe. Shadow IT senders resolve to named services with named owners, each owner confirms and authorizes the service, and the domain ramps through quarantine to reject with the sender inventory already complete. Valimail keeps monitoring senders and DKIM after enforcement, so a new unauthorized service is caught rather than discovered after an incident. Visibility is what turns DMARC from a report you keep receiving into a posture you finish and maintain.

It is an administrator granted OAuth connection to Microsoft 365 or Google Workspace that reads inbound message metadata. By seeing which internal recipients receive mail from a given service, it identifies the team that owns that sender, which is the information needed to authenticate every legitimate sender before enforcing DMARC.

No. It reads message headers and metadata only, never bodies, attachments, or links. Valimail authenticates senders with a deterministic, policy based model rather than AI, so message content is never required. The authentication engine holds zero personal data.

Standard tools rely on aggregate reports, which list sending IPs but not internal recipients. The detailed failure reports that carry more context are largely withheld by Microsoft 365, Google, and Yahoo for privacy reasons, so a monitoring only tool cannot trace a sender to the team that adopted it.

No. It works with Microsoft 365 and Google Workspace, which are cloud mailboxes it can connect to. Domains that run mail on premises need a separate approach. In a mixed Japanese group, the Connector covers the cloud hosted domains and the rest use the standard aggregate report workflow.

It reads metadata rather than content, so the authentication engine holds no personal data, which aligns with Personal Information Protection Commission expectations. Access is scoped to the domains you connect and revocable at any time. Valimail also holds SOC 2 Type 2 and is FedRAMP authorized.