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Use cases → Email operations

Enforce standard email signatures for all users

Set and maintain a consistent signature template across the organisation using a delegated service account and the Gmail API.

Who it is forIT and compliance teams tasked with branding and legal disclaimers.
APIsGmail API
Typical scopesgmail.settings.basic

The problem

Manual signature updates are ignored, misapplied or overwritten by users, leading to inconsistent branding and missing disclaimers. Compliance and external perception are both at risk, especially after rebrands or regulatory changes.

How it works

  1. Build a signature template with placeholders for user-specific fields.
  2. Fetch user details (e.g. name, title, phone) from Directory or an authoritative source.
  3. Iterate through all users with a delegated service account.
  4. Call the Gmail API to set the signature for each user’s primary send-as address.
  5. Schedule regular re-application to catch manual edits or new joiners.

What changes

Every user’s email signature matches policy, with updates rolled out centrally and automatically.

The trap in this one. The Gmail API only updates the signature for the default 'send-as' address. If users have additional aliases or custom 'send-as' addresses, these are silently ignored and retain old or non-compliant signatures. This is not flagged in the API response, so you must enumerate and update every send-as identity explicitly or risk missing visible outbound mail.

Questions people ask

Can users still edit their signatures after this runs?

Yes, unless you re-apply regularly. The API does not lock the signature, so user changes persist until the next enforcement cycle.

Does this update signatures in Gmail mobile apps?

No, mobile app signatures are managed separately by end users and are not controlled via the API.

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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