[exim] Rewriting sender based on recipient?

Supposing to have aliases (strictling speaking: a LDAP query, but also a
file, is irrilevant) that have as destination local and remote addresses
(clearly, not only one of them: mixed up).

There's some way to rewrite sender, setting 'errors_to = ', based on the
recipient address, eg only for nonlocal recipient?


Thanks.

-- 
  Vendere no, non passa tra i miei rischi,
  non comprate i miei dischi e sputatemi addosso.    (F. Guccini)