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Use cases → Admin and governance

Enforce email retention across the organisation with a delegated service account

Apply and audit email retention policies centrally, using a service account to ensure all mail is handled regardless of user participation.

Who it is forIT and compliance teams responsible for regulatory or internal email retention requirements.
APIsGmail API, Admin SDK
Typical scopesgmail.modify, admin.directory.user.readonly

The problem

Manual retention enforcement relies on users and is impossible to verify at scale; compliance gaps emerge when users delete mail or move it outside managed folders. Delegated automation is needed to centrally apply, verify, and report on retention across all accounts.

How it works

  1. List all active users with Admin SDK.
  2. For each user, impersonate using the service account and scan mailboxes for policy matches and violations.
  3. Apply labels, move mail, or delete as needed per retention rules using the Gmail API.
  4. Log all actions and exceptions for audit purposes.

What changes

Retention is enforced regardless of user behaviour, with a verifiable audit trail and policy coverage across all mailboxes.

The trap in this one. Using the Gmail API's batchModify or batchDelete operations will silently skip messages in the spam and trash folders, even if they match your retention criteria. This means mail 'in scope' for deletion or retention can persist unnoticed if a user moves it to trash before the policy runs. Regularly include explicit checks on these folders, or violations will escape enforcement and auditing.

Questions people ask

Does this approach work for suspended or inactive accounts?

Yes, as long as the account still exists and the service account can impersonate it, retention policies can be enforced regardless of user status.

Is it possible to undo retention actions if a rule changes?

No, deletions via the Gmail API are permanent after the trash retention window. Test on sample accounts before running at scale.

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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