Bob here.  Even though Office 365 is going strong, there are still a lot of folks on its predecessor, BPOS.  And although anti-spam protection is included with BPOS, it’s not the clearest thing in the world to configure.

I stumbled on this site recently, BPOS Tutor, that includes a nice 90-second video that shows how a BPOS administrator can easily add email addresses, domains and IP addresses to black/white lists.  Pretty straightforward.  And you can find it here.