[north@salami:exim4/conf.d]$ exim4 -bt david.north@ox.compsoc.net                                                              (17/03 18:27)
LOG: MAIN PANIC
  failed to expand "${extract {cn}{${lookup ldap{ ldaps:///dc=${quote_ldap:$domain},ou=domains,ou=mail,dc=ox,dc=compsoc,dc=net??sub?(cn=${quote_ldap:$local_part}) }}}}" while checking a list: lookup of "ldaps:///dc=ox.compsoc.net,ou=domains,ou=mail,dc=ox,dc=compsoc,dc=net??sub?(cn=david.north) " gave DEFER: ldap_search failed: -7, Bad search filter
david.north@ox.compsoc.net cannot be resolved at this time