Homepage: https://www.zimbra.com/

• localhost in system status - If you get a second server localhost in system status
• restore mailbox - zimbra restore mailbox
• missing emails - because of duplicate message ids
• dns lookup problem - dns caching (change /etc/resolv.conf)
• add not spam domain - add emails to option:mail:spam
• iOS mail config - how to add a Zimbra account to your apple device
• Insert own certificate in zimbra
• On relay provider the ssl fingerprint chaned - fetchmail