Once a message template is published on the execution instances, it can be unpublished.
This capability is available starting Campaign 20.2 release.
Indeed, a published template can still be called. Therefore, if you are no longer using a message template, it is recommended to unpublish it. This is to avoid sending an unwanted transactional message by mistake. For example, you published a message template that you only use for Christmas campaigns. You may want to unpublish it after the Christmas period is over, and publish it again next year.
Also, you cannot delete a transactional message template that has the Published status. You must unpublish it first.
To unpublish a transactional message template, follow the steps below.
In the control instance, go to the Message Center > Transactional message templates folder of the tree.
Select the template you want to unpublish.
The transactional message template status changes back from Published to Being edited.
Once unpublication is complete:
Both message templates (applied to batch and real-time type events) are deleted from each execution instance. They no longer appear in the Administration > Production > Message Center Execution > Default > Transactional message templates folder.
Once a template is unpublished, you can delete it from the control instance if needed. To do so, select it from the list and click the Delete button on top right of the screen.