Yes, I read and searched more, Java 1.5 swap made the difference.
And also made dns and MX entries as this is helpful
PG 19 Zimbra Quick Start:
Mac Software Requirements
The Mac server should have OS X 10.4.4 installed and Java 1.5 installed.
Java 1.5 should be set as default.
Note: To set Java 1.5 as the default:
• su - root
• cd /System/Library/Frameworks/JavaVM.Framework/Versions
• rm CurrentJDK
• ln -s 1.5.0 CurrentJDK