There are different options for communication between the R/3 System and the program Mlunxsnd which handles the forwarding of messages to be sent to the mailing program. These depend on which activation type the RFC link was created with:

The program Mlunxsnd is registered as an RFC server on the R/3 application server. It is also started manually and then runs as a daemon process on the application server. We recommend this activation type because the administrator, depending on the system load, can start any number of processes and through this has control over the computer resources.

Program Mlunxsnd is automatically started by SAPconnect when required. When there is a high system load, the result is that the administrator has no control over how many processes are started. The SAP Internet Mail Gateway runs either on an application server or on an external computer. In the last case, the program is either called via a remote shell, or an R/3 stand alone gateway is installed. In order to be able to use this activation type for AS/400, you require a program which is not contained in the delivery.