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Email security for Google Workspace

What Gmail protects you from out of the box, the admin settings worth changing, the gap that remains, and how an API-based layer fits into Workspace.
By · October 14, 2026 · 5 min read
Hands typing on a laptop at a desk
Photo: Glenn Carstens-Peters on Unsplash

What Gmail already does

Gmail filtering is strong and always on. It works best against anything Google has seen before across its own mail traffic.

  • Spam and bulk campaigns sent to many recipients.
  • Known malware in attachments, and many malicious links.
  • Senders and domains already flagged elsewhere.
  • Mail that fails SPF, DKIM or DMARC for domains that publish them.

Settings worth changing

Setting
Where
Why
Enforce 2-Step Verification
Security → Authentication → 2-Step Verification
A phished password alone no longer opens the mailbox
Gmail safety protections
Apps → Google Workspace → Gmail → Safety
Extra checks on attachments, links, and spoofed or lookalike senders
Block automatic forwarding
Apps → Google Workspace → Gmail → End User Access
Stops a compromised mailbox quietly copying mail outside
DKIM signing
Apps → Google Workspace → Gmail → Authenticate email
Needed for DMARC on your own domain
Review third-party app access
Security → Access and data control → API controls
See which apps can read mail, and remove what you do not use

What still gets through

The mail that reaches inboxes despite all of the above shares one property: nothing about it has been seen before.

  • A message written for one person, from a domain registered days ago.
  • No attachment and often no link - just a request to pay or change details.
  • A display name that matches a real contact, on a domain one character off.
  • A first-time sender claiming to be someone who has written many times before.

These are business email compromise, invoice fraud and targeted credential phishing - see how business email compromise works for an annotated example.

Adding Zoes to Workspace

Zoes connects through domain-wide delegation, the standard Workspace mechanism for organization-wide apps. Mail routing does not change.

  1. 1Sign in to Zoes with a super admin account.
  2. 2In the Admin console under API controls → Manage domain-wide delegation, add the client ID and scopes Zoes shows you.
  3. 3Choose which users to protect from the synced directory.
Zoes verdict
What happens in Gmail
Dangerous
Labelled Dangerous and removed from the inbox
Suspicious
Labelled Suspicious and removed from the inbox
Spam
Moved to Spam
Graymail
Moved to the Promotions tab
Likely safe, Unknown
Left where it is

Zoes scans the Primary and Updates tabs. Promotions, Social and Forums are not scanned. Remove the delegation in the Admin console at any time to revoke access.

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