We have a "fake" domain (the old "Internet" one from leftovers of 4.x and 5.x days)

Since we STILL have users that have this in their address books, we cannot delete the domain. It is a dummy domain and has no actual MTA

But Monitor sees it as "unknown"

What's the appropriate way to NOT monitor it?

do I make a new group and stick it in there and have no notifications?