Re: [exim] Virtual mailboxes not working on new install.

I'd say that your needs are complex enough that you should run a fully
custom config. The example one in the project source distribution is
a reasonable place to start - but you will be radically adding to it.
For that you need to understand how Exim works, and what parts of
the config do in broad terms, and what details of the config syntax
provide you with what facilities.

You need to read the documentation.
--
Cheers,
Jeremy