Here we would like to draw your attention to SOIN transaction code in SAP. As we know it is being used in the SAP BC-SRV (Basis Services / Communication Interfaces in Basis) component which is coming under BC module (BASIS).SOIN is a transaction code used for BCS: Inbound Send Requests (SMTP) in SAP.
It comes under the package SBCOMS.When we execute this transaction code, SAPLSBCS_IN is the normal standard SAP program that is being executed in background.
Transaction SOIN technical data table
|Purpose||BCS: Inbound Send Requests (SMTP)|