'Use custom E-Mail Server with SAP SuccessFactors

How is it possible to use a custom mailserver for sending E-Mails from SAP SuccessFactors? Every System Mail should be send via custom server. I found this in a KBA:

SuccessFactors mail notifications can integrate externally with a customer, e.g. can you relay mail through a customers’ mail servers?

Yes this is possible. We can forward outgoig emails to customer's own SMTP server(s). We only need: the condition (recipient domain); the customer's SMTP server's IP and port; SMTP auth user and password if needed.

I can't find any description how to set this up. Any idea?



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