By default, Azure DevOps sends an email notification to team members after the compilation succeeds or fails. But in a CI/CD environment, we are more concerned about when the deployment is complete and then conducting manual or automated testing. Let's take a look at how to get Azure DevOps to automatically send mail notifications to team members after a successful deployment.
Enter Project settings in the bottom of left side bar.
Choose Notifications > New subscription
Click Release > A deployment is completed
The default settings is to send mail to all members of the current project when the deployment is complete. Specific settings can be changed according to your project needs, such as adding filtering criteria, selecting the Role of Notification member, and so on. Then click Finish to complete the configuration.
When you're done, you should be able to see this custom notification rule at the bottom of the list.
Now, trigger a deployment. If all goes well, you should be able to receive a similar email notification. I currently have two environments, and according to the configuration just now, any deployment on both environment will be notified. This is the staging environment: