Custom entity in the function Associate activities with multiple related records

In the previous article about 'Associate activities with multiple related records we were demonstrating that there is a new RELATED field through which you can assign one activity to multiple records. Currently, the functionality is in preview and works for Email activity types.

?

In the RELATED field, it offers records that have the 'Can have a contact email settings' enabled in customization. Detail regarding the Can have a contact email settings.

?

So, if you take a custom entity and set 'Can have a contact email settings' for it, you will be able to attach one Email activity to multiple records from your custom entity.