In Google Groups, a prefix is a short bit of text that is added to the front of the subject line when emails are distributed. A prefix makes it easier for people to identify messages coming from the group. If the prefix is reasonably unique, you also make it possible for recipients to create rules for processing the emails, e.g., move all messages from the group into a folder.
How to add a prefix to group messages
1. Sign into Google Workspace with your admin account.
- The direct link is https://workspace.google.com/
2. Navigate to Groups from the dropdown menu next to your profile icon.

3. Click the gear icon for the group you want to change:

4. Scroll down to Email options and specify the Subject prefix.

- Recipients can use the prefix to target or filter emails from the group, so use a prefix that uniquely identifies the group and will not likely occur in unrelated emails.
- Google recommends enclosing the prefix with square brackets, e.g., [Prefix]. This is not required; you can follow other patterns such as PREFIX: (all caps + colon).
5. Click Save changes.
6. Be patient – it can take a while for the change to appear on new messages.
References
- Add a prefix to subject lines of group messages (support.google.com) – Group owners and managers can add a prefix that appears in the subject line of all group messages. This helps recipients quickly identify that the message is from the group.

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