What I am about to ask help on is all second hand information. I have zero examples of this and have no idea where to look.
Client is using Office365 setup by their previous IT company.
The previous company asked the client to notify us (being me and others) to remove them off the list so when the "client" gets bounce back emails the previous IT company no longer gets emails about it.
Where in the portal would that be? I am poking around and have no idea where to look for such a request nor was ever aware of it.