Ok first things first...
I have a Virtualbox machine running CentOS 6.2 64bit. I installed version 7.1.4 of the Zimbra opensource using the RHEL version 6 64bit.

I followed this tutorial:

Installing Zimbra Collaboration Suite 7 On CentOS 5.x (64Bit) | HowtoForge - Linux Howtos and Tutorials

figuring it to be pretty much identical to CentOS 6.2 but it is not.

I noticed a couple of things when I installed it.

1. To be able to get passed the creation of a self signed certificate you needed to open up sudoers file...
Code:
visudo
and place after...
Code:
Defaults requiretty
This extra bit...
Code:
Defaults:%zimbra !requiretty
Defaults:zimbra !requiretty
2. To make sure that zmconfigd can run successfully you also need to ensure that the package NC is installed. Which can be done by performing this...
Code:
yum install nc
So right now everything has installed nicely and the only thing that isn't running is MTA

I don't know why it doesn't want to start, if someone could be so kind as to point me in the right direction or maybe like point 2 I need to install something that wasn't installed when I did minimal install.

Cheers,
Steve