Split DNS is detailed in the wiki
here. You should also disable ipv6 on the Zimbra server.
You posted the install logs earlier, they show this error:
Quote:
Creating server entry for postmaster.usys.com...
*** Running as zimbra user: /opt/zimbra/bin/zmprov -l cs postmaster.usys.com
ERROR: service.FAILURE (system failure: createServer) (cause: javax.naming.NamingException [LDAP: error code 80 - internal error])
Done
Setting spell check URL...
*** Running as zimbra user: /opt/zimbra/bin/zmprov -l ms postmaster.usys.com zimbraSpellCheckURL http://postmaster.usys.com:7780/aspell.php
ERROR: service.FAILURE (system failure: unable to lookup server by name: postmaster.usys.com message: [LDAP: error code 80 - internal error]) (cause: javax.naming.NamingException [LDAP: error code 80 - internal error])
Done
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Specifically this line:
Quote:
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ERROR: service.FAILURE (system failure: unable to lookup server by name:
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that seems self-explanatory to me. Your DNS isn't set-up correctly. It can't be found, you need A & MX records pointing to this server - the install routine doesn't seem to think one or other of them exists.