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Use cases → Admin and governance

Synchronise email signatures across all users with domain delegation

Update every user's Gmail signature centrally by pushing changes via a delegated service account, ensuring consistency and compliance.

Who it is forIT admins responsible for enforcing up-to-date email signatures across all staff.
APIsGmail API, Admin SDK
Typical scopesadmin.directory.user.readonly, gmail.settings.basic

The problem

Manual updates or user-driven instructions for signature changes are ignored, inconsistent, or delayed, which undermines branding and legal compliance. Central enforcement avoids drift but must work reliably at scale.

How it works

  1. Fetch the current user list from the Admin SDK.
  2. For each active user, impersonate with the delegated service account.
  3. Push the desired signature using the Gmail API's settings endpoint.
  4. Log successes and failures for audit and troubleshooting.
  5. Schedule periodic re-syncs to catch new or reverted users.

What changes

All users have the correct, centrally-managed signature without requiring manual intervention or relying on user compliance.

The trap in this one. The Gmail API's signature update is not immediately visible to the end user in the Gmail web UI, especially if their mailbox is open during the update. In practice, users with Gmail open in a tab may continue sending with their old signature until they refresh or reopen the compose window, leading to inconsistent use even after a successful API call.

Watch it explained

“Streamlining email signature management for Google Workspace - Recorded webinar” — Bybrand on YouTube. Third-party video, included because it covers this ground well. We are not affiliated with the channel.

Questions people ask

How do I handle users who manually change their signature back?

Schedule regular reapplication of the signature, and consider alerting or restricting signature editing through admin controls where possible.

Is there a way to confirm the signature is live for every user?

You can fetch the signature via the same API after updating, but this only confirms the backend state, not what is rendered in open browser sessions.

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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