Bytemark have provided the following solution to the query above:
The files we are wanting to add to are:
We are looking to create a link to these files in
first we need to ensure the admin user can write to these files:
sudo chown root:admin /etc/exim4/blacklist/*
sudo chmod 664 /etc/exim4/blacklist/*
Then we create the folder structure:
Then create the links:
ln -s /etc/exim4/blacklist/* .
This will create the links for you and you will be able to write to them as the
I tend to edit the exim blacklist files regulary and I prefer to do so as the admin user so I've found this solution v handy.