domainwidedelegation.comStart free

Use cases → Admin and governance

Apply organisation-wide email footer updates via API

Update signatures for all users centrally, ensuring consistent legal and branding text across every mailbox in the domain.

Who it is forIT administrators responsible for legal disclaimers or brand consistency in outbound email.
APIsGmail API, Admin SDK
Typical scopesadmin.directory.user, gmail.settings.basic

The problem

Manual signature management is error-prone and slow, especially in large organisations or when a legal change is urgent. Relying on users to update their own signatures leads to inconsistency and compliance risk.

How it works

  1. Enumerate all active users using the Admin SDK.
  2. For each user, authenticate as a delegated service account with appropriate scopes.
  3. Use the Gmail API to update the send-as signature for each user.
  4. Log every update attempt, including errors and affected user IDs.
  5. Optionally, verify changes by reading back updated settings after a delay.

What changes

All users have the correct, centrally managed email footer within hours, with a full audit trail of changes applied.

The trap in this one. The Gmail API's signature update endpoint is eventually consistent and does not guarantee immediate propagation. Updating too quickly in succession (such as in a tight loop for thousands of users) can cause requests to be rate-limited or silently dropped, resulting in some accounts not being updated. Always implement retry logic with exponential backoff and verify updates after a delay, or you will miss users without any explicit error.

Questions people ask

Can I update all signatures at once with a single API call?

No, you must update each user's signature individually. There is no bulk endpoint for signatures.

How do I ensure every user actually received the new footer?

Read back the signature setting for each user after a delay to confirm the update. Do not assume a successful API response means the change is visible in the UI immediately.

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

Related use cases

Automate joiners, movers and leavers

Create accounts, set group membership, provision Drive and hand over mailboxes without a manual checklist.

Continuously verify your delegation still works

A scheduled probe that proves every API still answers under every tenant, before a customer finds out otherwise.

Reduce an over-broad delegation grant safely

Find out which scopes your automation genuinely uses, then cut the grant down to them.