The environment endpoint, /actuator/env, provides information about the environment properties, which can be very helpful during troubleshooting issues. As you can see in Figure 14.1, this endpoint shows properties from different property sources:

We can use the property's name to ask Actuator to return only the related information. For example, we can use /actuator/env/app.mail-from to see the value of the app.mail-from property.