Email Source: Neustar SiteProtect

Homepage: https://www.home.neustar/about-us/news-room/press-releases/2017/SiteProtectNG

This source is known to forward email

Capable of generating DMARC compliant email for others

Yes

Our data indicates Neustar's SiteProtect infrastructure supports DMARC compliance via SPF.

Capable of signing email with DKIM for others

No

Capable of sending SPF compliant email for others

Yes

Contact Neustar or your respective provider that's using their infrastructure for SPF setup.