Now you need to setup the ham, spam, galsync, and virus-quarantine accounts to your new domain.
Lets start with ham and spam.
From zimbra webadmin find the spam and ham accounts under manage and then search individually for ham and spam. They will have random characters after the name. We will need the full name of both accounts. Right click to edit the account and under account name change the domain to your newly created domain and save. Do this for both accounts. Also get the names of both accounts. You can copy and paste them to use in the following command line.
As zimbra user on the mail server run these commands.
You can also check the current spam accounts with
zmprov gcf zimbraSpamIsSpamAccount