Starting app version 6.0, a user can enable email notifications for the events based on custom sources, assuming the email notifications are globally enabled by an admin, in the app configuration.
Besides such sources as Jira dates, Jira sprints, and Jira versions, the custom sources can be added to a calendar configuration.
The custom sources are default event types:
Vacations and leaves
and all custom-defined event types.
The default event types can be easily selected when adding a source to a calendar configuration.