First, you should make sure that your local DNS is correct by running the dig commands I gave you in an earlier post. You should also set the ldap entries to be the following:
you can do that with the zmlocalconfig command using the '-e' option (have a look in the wiki).
ldap_host = mail-01.emerson-school.org
snmp_trap_host = mail-01.emerson-school.org
zimbra_server_hostname = mail-01.emerson-school.org
Just an FYI, when you want to run as the zimbra user do an 'su - zimbra' note the hyphen it is important.