I have installed the latest version of Zimbra and all is well.
The only problem I am having is that external mail seems to be returned rejected
by mail servers seeing it as spam.
The server is behind a NAT Firewall (untangle) , our external mail is hosted (POP)
by a ISP.
It appears that the mail servers don't trust the sending IP?
Any help will be appreciated, I am not a network guru, so simple explanations would be welcome!