There is an existing alternate email for a group (group email alias)
- Admin console
- User and Organizational Level Management
- In your Google Admin console.
- Go to Menu > Directory > Groups.
- Click the name of a group.
- In the Group information section, click Aliases.
- Point to the Aliases section and click Edit.
- To remove an alias, point to an alias and click Remove.
Changes can take up to 24 hours, but typically happen more quickly.