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Use cases → Email operations

Monitor email for keywords across an entire enterprise

Scan all user mailboxes for compliance or risk keywords using a delegated service account and the Gmail API.

Who it is forSecurity and compliance teams tasked with monitoring communications for policy breaches.
APIsGmail API
Typical scopesgmail.readonly

The problem

Manual monitoring is infeasible at scale, and missing a sensitive keyword can have regulatory or reputational consequences. Automated scanning is essential, but must not disrupt user experience or privacy controls.

How it works

  1. Register a service account and grant domain-wide delegation for read-only Gmail access.
  2. Iterate over all active users and impersonate each to search their mailbox for the target keywords.
  3. Log matches with message IDs and user context for audit and review.
  4. Throttle requests to stay within per-user and global Gmail API quotas.
  5. Rotate through users incrementally to avoid triggering suspicious activity alerts.

What changes

All mailboxes are scanned for flagged content, with results centrally logged for compliance review. No user intervention is required.

The trap in this one. The Gmail API's search index lags behind delivery, especially for large tenants. If you scan immediately after a message arrives, it may not be discoverable by query for several minutes or longer. This leads to missed matches unless you re-scan recent mail for a trailing window — a gap that isn't documented and only surfaces when a test message is 'invisible' to the API right after delivery.

Questions people ask

How often should we scan to avoid missing messages?

Include a short trailing window (e.g. rescan the last hour) each run to catch messages that were delayed in the search index. The exact lag varies with mailbox size and Google-side load.

Does this approach trigger user alerts or visibility?

Not directly, but heavy or rapid scanning can cause Google to flag the service account for abnormal activity, so throttle and monitor your usage.

Want this built?

This is a pattern we run in production. We will set up the delegation and build this on top of it — $500 per hour, most of it working the same day.

Talk to us Or read the setup guide

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