So....nobody seems interested in this case.
I believe I need to hack the source to enable such a thing.
> From: Nicolas Dorfsman <ndo@???>
> To: exim-users@???
> Subject: Limiting spool space used by secondary MX
> Date: 12 Sep 2002 10:45:29 +0200
>
>
> Hi,
>
>
> My server is secondary MX for a list of domains.
>
> I need to limit the space used by these domains; in other words I want
> to relay all their mails until they reach their own size limit.
>
>
> Is there any way of doing this in exim 3 or 4 ?
>
> Any help would be appreciated.
>
> Thanks
>