Can't access to webmail


I can’t access to my webmail. I have one domain and I setup an account. Everything seems fine but when I try to access to or to, it doesn’t work. It seems that I need to setup also a DNS record, but I thought that it was going to be done automatically.

So, I want to use the standard dreamhost webmail (I don’t want to use gmail), but it seems that the system expects that I setup, but although is working, it doesn’t works with the webmail subdomain.

I click in the “Manage email” toolbox and I have one email address created, but if inside that page I click in “mailbox manager”, it tries to go to, and webmail is not a subdomain. What should I have to activate it??

thanks ans best regards,