SuccessFactors is capable of sending DMARC compliant email because they support custom SPF and DKIM configurations that achieve DMARC alignment. SuccessFactors is an Employee Benefits Platform and is often used by Human Resources teams.
You must contact SAP SuccessFactors support to enable DKIM. For more information, visit: https://userapps.support.sap.com/sap/support/knowledge/en/2688533
The link just below is a resource on how to configure this source to send SPF-aligned email on your behalf. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. https://userapps.support.sap.com/sap/support/knowledge/E/2087468