ZCS cannot receive emails from Internet
I have installed Zimbra Collaboration Suit 8.0.3 with Split-DNS on Ubuntu 12.10 Server Successfully (1st time)
Ubuntu have no built-in firewall & all ports are open for Zimbra (temp) in external firewall,
53, 25, 110, 22, 80, 143, 443, 993, 995 ports are forwarded to Zimbra Server.
I can Send emails from Zimbra to any email Server without any issue, but cannot receive any email from Internet, on the local domain it works fine.
I follow this Guide for installing Zimbra (Fairly easy)
but I don't understand, what i'm missing ?
MX Lookup Tool Said,
Loop detected! We were referred back to '18.104.22.168'
Please help, Thanks.