A long time ago, before I was on dreamhost, I had google apps handle the email on one of my domains. The domain is hosted at godaddy. I hardly ever used it. Now I moved the hosting to dreamhost and email works fine (using imap, password is different than before), but it's also still showing up in one of my other gmail accounts and I have no clue how. I deleted everything I could find referring to that address from the settings in my other gmail account, but mail still arrives there.
The dreamhost nameservers are set in godddy.
MX record stuff is set to "Use DreamHost's mail features with no funny business!"