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Use cases → Admin and governance

Automate company-wide email signature updates

Push new signature templates to every user mailbox using domain-wide delegation, ensuring compliance and branding across the organisation.

Who it is forIT admins and support teams responsible for branding and compliance.
APIsGmail API, Admin SDK
Typical scopesgmail.settings.basic, admin.directory.user.readonly

The problem

Manual updates to signatures are error-prone and impossible to enforce at scale. Relying on users to update their own settings leads to inconsistent branding and out-of-date information.

How it works

  1. List all active users via the Admin SDK.
  2. For each user, impersonate using domain-wide delegation.
  3. Use the Gmail API to set the signature template, merging in user-specific fields.
  4. Log each update and flag any accounts that fail to update.
  5. Optionally, notify users of the change for transparency.

What changes

Signatures are updated across the organisation within minutes, with a single template and consistent user details.

The trap in this one. The Gmail API’s signature update endpoint is eventually consistent—if you push updates too quickly in succession (e.g. due to retries or parallelism), older values may overwrite newer ones due to replication lag. In practice, this produces silent reversions where a user’s signature briefly shows the old template, confusing users and support. Always de-duplicate and throttle writes per user.

Questions people ask

Can this process update signatures for users who are currently signed in?

Yes, but users may see the old signature for several minutes due to API and UI caching, especially in web clients.

How should user-specific fields be handled?

Pull user attributes from the directory and interpolate them into the template before writing. Validate for missing fields to avoid partial signatures.

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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