Sending Email notifications requires integration with an email server. This is one of the common integrations and the first one in the section.
If the switcher is enabled, you will see the Email notifications settings:
Service: there are three types of service available:
Built-in server: TurnKey Lender’s own server
Simulator: A simple simulator with which you can check the notification without extra charges during the testing period
Custom server: Requires additional settings and allows you set up integrations with such mailing server providers as Mandrill from Mailchimp, Gmail, Sendgrid, and ActiveCampaign (only for the US).
Details of each integration are provided in the relevant section