Problem
How can you prevent that users send emails to external contacts, and only allow sending emails to internal users?
Environment
- Gmail
- Admin console
Solution
You must create a Routing Rule in the Admin console by following these steps:
- Go to the Admin console.
- Go to Apps > Google Workspace > Gmail > Routing > Routing.
- Click Add another rule and then Configure.
- In the rule add a description.
- Check Outbount.
- Switch from Modify Message to Reject message.
- Click Show options.
- Check Use address lists to bypass or control application of this setting.
- Select Bypass this setting for specific addresses / domains.
- Add a list.
- Then check Only affect specific envelope senders and add the email address that's not allowed to send emails
- Save.
Cause
These steps are to prevent that a user sends emails to external users and only allow internal