[Pkg-exim4-users] Setting local_domains via update-exim4.conf.conf

[x_debian-exim4-users_x at nospam.pz.podzone.net]

Hi, I have a problem with exim + debconf, but maybe i misunderstand
how it should work...

In file /etc/exim4/conf.d/main/01_exim4-config_listmacrosdefs:

.ifndef MAIN_LOCAL_DOMAINS
MAIN_LOCAL_DOMAINS = DEBCONFlocal_domainsDEBCONF
.endif
domainlist local_domains = MAIN_LOCAL_DOMAINS

In file: /etc/exim4/update-exim4.conf.conf

dc_local_domains='@:localhost:dsearch;CONFDIR/virtual'

The above does not work (mail is not accepted for my virtual domains).
However it works absolutely fine if instead,

In file: /etc/exim4/conf.d/main/00_local-config_macros

MAIN_LOCAL_DOMAINS = @:localhost:dsearch;CONFDIR/virtual


So my question is how to set local_domains using the debconf mechanism
via update-exim4.conf.conf ?