Documentation of SEND ... USING from the Help screen:
SEND Action
The SEND action allows sending a notification to a particular notification receiver. For example,
SEND ReservationOfferEmail TO Reservation.Member
The receiver of the notification must be an intelligent business object with active communication channels (see Intelligent Business Objects).
The VIA keyword can be used to indicate the specific channel through which a notification will be sent, for example
SEND ReservationOfferNotification TO Reservation.Member VIA Email
If the VIA keyword is not specified, the default channel of the business object is used.
The USING keyword can be used to send emails using a particular email account, for example:
SEND ReservationOfferNotification TO Reservation.Member USING EmailAccount
Here the instance of the EmailAccount object is taken from the Context and it should contain email account values to use when sending an email (host server, port, authentication details etc). Therefore, the object representing an account must have certain attributes defined. The definition of such an object can be created in the Configuration Tool using the “Add Outgoing Email Account” command.
