Indonesian Zimbra Community has been setting up the Zimbra binary mirror in Indonesia for fast access all around Indonesia. Below is the links :

5.0.21
1. Index of /binary/5.0.21
2. Index of /addons/zimbra/5.0.21

6.0.4
1. Index of /binary/6.0.4
2. Index of /addons/zimbra/6.0.4
3. ftp://zimbra.pnyet.web.id/binary/6.0.4_GA/