Transfering mail

I am transfering a domain to Dreamhost and while the web part is important, email is more important. When I change the nameservers, do I have to do anything extra for the mail to resolve to the right place? I have the addresses mirrored over and ready to accept messages.

You need to make sure your domain’s MX record points to the correct place. If you’re unsure where it should point to contact support to find out the proper server you should be using for it.