[Exim] Rejecting all mail to a domain except postmaster's

Hi

I am using exim 3.36 on a mail gateway.
It's acting as a hub for many domains.
One domain is going to be decomissioned, but until the changes are done in DNS I'd like to configure exim to reject all mail to that domain except those sent to abuse and postmaster.

How can I do this?
I couldn't find the answer in the docs. Documentation pointers are also welcome.

Thank you.

g.