[Exim] reading a host list from a file whose name the result…

Hi,

when I have in my acl

deny message = go away
    hosts = /etc/exim4/local_host_blacklist

everything works as desired. I can write host names, IP addresses and
network/prefix in the file and the hosts named in the file are
blocked.

However, when I want to have that option in the default configuration
of exim in a Linux distribution, I can't have exim failing on me if
the file does not exist. So, I wrote:

deny message = go away
    hosts = ${if exists{/etc/exim4/local_host_blacklist}\
               {/etc/exim4/local_host_blacklist}\
               {}}

However, exim does seem to interpret the string returned by that
expression as a host name instead of a file.

Any idea how to solve this?

Greetings
Marc, having spent his first time with exim 4 acls and being quite
impressed

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