Phil Howard:
> Every address in these domains will be rewritten to some other address
> (not all with the same domain) and sent on their way. Some of them
> will be rewritten to addresses that do fall into other classes for
> some kind of local delivery (right now, in virtual mailbox).
You give pretty much the definition of a Postfix virtual alias
domain.
All addresses are rewritten to an address in a different local or
remote domain, therefore, the domain must be listed as a virtual
alias domain, as per ADDRESS_CLASS_README.html.
Wietse
