During the T206861 incident, it was discovered that the scheduled maintenance notices were only addressed to the personal email addresses of a handful of people (Mark, Brandon, myself, Rob, Arzhel).
These notices should go to maint-announce@ instead. I didn't find an obvious way to do this in the panel, so unless I missed it, we should probably ask Equinix about it.
(h/t to @ArielGlenn for double checking and discovering this!)