The SMTP plugin is enabled via icm/server_port_ with PROT=SMTP. What exactly does setting its PORT to zero do — and what does it NOT do?

SAP S/4HANA Administration · Internet Communication (ICM/ICF)

The SMTP plugin is enabled via icm/server_port_<xx> with PROT=SMTP. What exactly does setting its PORT to zero do — and what does it NOT do?

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