[exim] Q: Howto setup a simple mailinglist?

Hi all,

i am using a more or less standard exim setup.

Now i like to use a very simple Mailinglist.
The list is very static and small, so that it is enough to have a list
of users in the aliases file.

But in this case the hole world can send to this alias, but i like to
have an ACL for this alias, so that only one sender or users only from
our local domain can send to this list.

I have seen in the doku that i have lots of possibilities with
filters and acls, but i don't know where to begin.
Or is it easier so setup an ordinary mailinglist?

tnx Stephan