#1.7
  dkim_domain = ${if \
                    eq{$sender_address_domain} {}\
                    {${lookup {${lc:${domain:$h_from:}}} lsearch,ret=key {/etc/virtual/domainowners}\
                        {$value}\
                        {$primary_hostname}\
                    }}\
                    {${lookup {$sender_address_domain} lsearch,ret=key {/etc/virtual/domainowners}\
                        {$value}\
                        {$primary_hostname}\
                    }}\
                }
  dkim_selector = x
  dkim_private_key = ${if exists{/etc/virtual/$dkim_domain/dkim.private.key}{/etc/virtual/$dkim_domain/dkim.private.key}{0}}
  dkim_canon = relaxed
  dkim_strict = 0