Use transaction code NACE. Define the output type here. In application V3, define the correct transmission medium. If you want to send it at your convenience select the dispatch time as 3 (Send with application own transaction). Attach the output type to the correct output determination procedure defined for the document type. Use T Code VF31 to send the message. You will need basis while configuring the email addresses because SCOT and SOST will be used by it.