I'm planning on adding a new domain to my ZCS Open Source installation and I would like to know what I need to know before starting.

I have my DNS server outside zimbra machine.
I need to add a ssl certificate for the new domain too.
The hostname of the zimbraMachine is the email.firstDomainName.com I would like it to work on both old and new domain email.SecondDomainName.com .
I will need to split GAL between the two domains.

I have looked over the WIKI and I didn't see anything related to multi domain installation.

This is it mostly. Any tips would be greatly apreciated.

Thank You,