This has been getting increasingly embarrassing for me, and today is the final straw.
18.104.22.168 is on the list.
After ten years of happy hosting with DreamHost I'm no longer going to recommend it to my clients, and I'm going to have to try to migrate all non-GoogleApps clients to another service.
Your competitors manage to stay off the lists. Why can't you?
It's not something that DreamHost is doing. From the link you provided:
Wait! There's more....
You created an account on the forum just to complain? That's hardcore, that is.
22.214.171.124 isn't even a DreamHost IP address! That address is part of Google's mail systems.