If you are upgrading to Deployment Manager 4.7.x and using the Pega-Pipeline-CD email account for sending emails, the DMEmailListener email listener always listens to the Pega-Pipeline-CD account. If you are using a different listener, you must delete it.
Delete the listener that is listening to the Pega-Pipeline-CD account by doing the following steps:
In the header of Dev Studio, click.
On the Email: Integration page, on the Email Listeners tab, click the listener that you want to delete.