Local duplicate management is the part of duplicate management that is related to how the user interacts with duplicates. To have a look at the standard rules, navigate to Setup | Data | Duplicate Management | Duplicate Rules to bring up the following page:
Duplicate Rules main page
Let's edit the Contact rule and make sure the configuration is the same as that shown in the following screenshot:
Duplicate rule editing
If you scroll down on this form, you'll see information about matching rules, as shown in the following ...
