Notification recipients are the users or groups to which the activity sends e-mails. A recipient can be any mailbox-enabled user or mail-enabled group. There are also a number of options allowing you to select recipients based on their role, such as operation requestor, approver, manager of operation requestor, or manager of object affected by the operation.
Notification messages are based on a message template that determines the format and contents of an e-mail notification message, including the message subject and body. A template is an HTML-formatted document which you can view or change as required to customize notification messages. The template text may include dynamic content that is generated at run time by retrieving information from the running instance of the workflow process. You have the option to attach a report on the workflow execution results to the notification message. Notification messages are created, and normally sent, in HTML format. You can optionally configure the activity to format and send notification messages as plain text.