Thanks for all the help.
I have one more thing I need someone to evaluate.
Lets say that I set this virtual domain up outside of Zimbra in a postfix file. And in postfix, I specify the catchall address for that domain. This way Zimbra is not involved. Is it possible?
If it's is possible, I can script this every time a new account is created.
1) A script creates a new account named "email@example.com" in zimbra.
2) Script then directly create domain "blinkiz.dnstrafik.net" in postfix.
3) Script then create catchall on this new domain pointing to account in step 1.
Aaaa, is it possible?