Webmail, email and new Dreamhost account

I’ve transferred 3 domains over to dreamhost (the Crazy Go Insane plan), and now I have a pretty major problem: I cannot get the webmail to work for 2 of the 3 accounts, and cannot get some of their email accounts to work! The original domain’s webmail works just fine, but when I try going to webmail.domain.com for the other two, I get “webmail.domain.com cannot be found. please check the name and try again”.

Is there some major flag that new Dreamhost customers seem to miss when setting this stuff up, or am I just having supremely bad luck?

Nevermind. It was DNS wonkiness, after all.

My face is SO red!