Use cases → Admin and governance
Update Gmail signatures for every user at once
Roll out company-wide signature changes using a delegated service account to enforce consistency and branding.
| Who it is for | IT administrators responsible for email branding and compliance. |
|---|---|
| APIs | Gmail API |
| Typical scopes | gmail.settings.basic |
The problem
Manual signature updates are ignored, leading to inconsistent branding and missing legal text. Central enforcement requires direct API calls per user, which can hit rate limits and obscure partial failures.
How it works
- Fetch the full user list from the directory.
- Authenticate with a service account using domain-wide delegation.
- For each user, call users.settings.sendAs.patch to update their signature.
- Log all responses, including errors and skipped accounts.
- Optionally trigger a notification to users about the change.
What changes
All users receive the updated signature without relying on manual action, and administrators have a record of which accounts were updated.
Watch it explained
“UMS Bulk Email Signature Google Workspace Add-on – OAuth Scope Usage & Verification Demo” — UMS Tech Labs 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 with multiple aliases?
Enumerate all sendAs addresses for each user and patch each one; the API does not update them in bulk.
What if a user is suspended or has no mailbox?
The API will return an error; log these cases for follow-up but do not retry indefinitely.
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 guideRelated use cases
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