DO is a major source of spam. Hetzner is closely behind. OVH is third. We are now flagging all mail coming from their IP space as junk, but without blocking it

DO is a major source of spam. Hetzner is closely behind. OVH is third. We are now flagging all mail coming from their IP space as junk, but without blocking it, because there are (very) occasional legit senders there.