I have been able to install Zimbra on Ubuntu lts 6.06 and send out email, but incoming email is stuck in the deferred massage folder. the reason for the error is "connect to mail.manitoueng.com [18.104.22.168] connection refused".
I am not sure why it is looking for the public IP address. I have the machine behind a router/firewall and have given the mail.manitoueng.com a private ip address. If the mail can make it to the machine and into the queue, why can't it get delivered to the individual mail boxes.
frustrated first time user