dkim_domain = ${lookup{${domain:$h_from:}}partial-lsearch{/etc/exim4/dkim-domains}{$value}}
dkim_selector = ${lookup{$dkim_domain}lsearch{/etc/exim4/dkim-selectors}{$value}}
dkim_private_key = /etc/exim4/dkim-keys/${dkim_domain}
dkim_domain = ${lookup{${domain:$h_from:}}partial-lsearch{/etc/exim4/dkim-domains}{$value}}
dkim_selector = ${lookup{$dkim_domain}lsearch{/etc/exim4/dkim-selectors}{$value}}
dkim_private_key = /etc/exim4/dkim-keys/${dkim_domain}