i have ZCS 7.0.12 on CentOS 64 Bit, this is my main server, mail.mydomain.com. so i tried to install a new server on a different machine mailer.mydomain.com . this was CentOS 6, and ZCS 7.0.12 for EL6. since i didnt want recreate users i just followed the Multi-Server installation guide on the forums.

I enabled LDAP replication on mail.mydomain.com.
I failed to do the installation hence i stopped.
Surprisingly when i did zmcontrol status on mail.mydomain.com i saw:
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[zimbra@mail root]$ zmcontrol status
Host mail.mydomain.com
        antispam                Running
        antivirus               Running
        imapproxy               Stopped
                zmnginxctl is not running
        ldap                    Running
        logger                  Running
        mailbox                 Running
        memcached               Running
        mta                     Running
        snmp                    Running
        spell                   Running
        stats                   Running
        zmconfigd               Running
so when executed
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zimbra@mail root]$ zmnginxctl restart
Stopping nginx...nginx is not running.
Starting nginx...nginx: [error] host not found in memcache:server mailer.mmydomain.com:11211
it shows its now looking for the email server that i was trying to install, All seem to be fine though on the server, i can send and receive emails via pop3 and IMAP. so is this service required