Mutilply Domains

[khenderson]

Currently have a production email domain p-ca.com. I also have a domain mailpca.us. I installed Zimbra using domain mailpca.us for testing, so of course everyones address would be xyz@mailpca.us. How can I now add p-ca.com as a supported domain in Zimbra ? But more importantly how can I make p-ca.com the persons primary email address (when user sends out an email it uses p-ca.com not mailpca.us. I need to keep my current email solution in place until I get everyones contacts and email converted into Zimbra, which may take several weeks. Thanks