[exim-dev] Odd deny condition failure behaviour

deny

    condition    = \
                ${lookup{\
                    ${substr_18:$local_part}\
                }lsearch{/etc/exim/conf/$domain/disabled_tags}{yes}fail}

Why does this act as though condition evaluated to true and continue? (The lookup key doesn't exist in the file).

check condition = ${if eq{${lookup{$domain}lsearch{/etc/exim/conf/domains}}}{tagged}{yes}{no}}
                = yes
search_open: lsearch "/etc/exim/conf/DOMAIN/disabled_tags"
search_find: file="/etc/exim/conf/DOMAIN/disabled_tags"
  key="1hjyqx0006qrms" partial=-1 affix=NULL starflags=0
LRU list:
  :/etc/exim/conf/DOMAIN/disabled_tags
  :/etc/exim/conf/domains
  :/etc/exim/conf/tagged
  :/etc/mail/aliases
  :/etc/mail/aliases_wild
  :/etc/exim/conf/users
  :/etc/exim/conf/DOMAIN/users
  :/etc/exim/conf/backup
  :/etc/exim/conf/bsmtp
  :/etc/exim/conf/DOMAIN/aliases
  End
internal_search_find: file="/etc/exim/conf/DOMAIN/disabled_tags"
  type=lsearch key="1hjyqx0006qrms"
file lookup required for 1hjyqx0006qrms
  in /etc/exim/conf/DOMAIN/disabled_tags
lookup failed
search_open: lsearch "/etc/exim/conf/DOMAIN/disabled_tags"
  cached open
search_find: file="/etc/exim/conf/DOMAIN/disabled_tags"
  key="1hjyqx0006qrms" partial=-1 affix=NULL starflags=0
LRU list:
  :/etc/exim/conf/DOMAIN/disabled_tags
  :/etc/exim/conf/domains
  :/etc/exim/conf/tagged
  :/etc/mail/aliases
  :/etc/mail/aliases_wild
  :/etc/exim/conf/users
  :/etc/exim/conf/DOMAIN/users
  :/etc/exim/conf/backup
  :/etc/exim/conf/bsmtp
  :/etc/exim/conf/DOMAIN/aliases
  End
internal_search_find: file="/etc/exim/conf/DOMAIN/disabled_tags"
  type=lsearch key="1hjyqx0006qrms"
cached data used for lookup of 1hjyqx0006qrms
  in /etc/exim/conf/DOMAIN/disabled_tags
lookup failed
search_open: lsearch "/etc/exim/conf/tagged"
  cached open
search_find: file="/etc/exim/conf/tagged"
  key="DOMAIN" partial=-1 affix=NULL starflags=0
LRU list:
  :/etc/exim/conf/tagged
  :/etc/exim/conf/DOMAIN/disabled_tags
  :/etc/exim/conf/domains
  :/etc/mail/aliases
  :/etc/mail/aliases_wild
  :/etc/exim/conf/users
  :/etc/exim/conf/DOMAIN/users
  :/etc/exim/conf/backup
  :/etc/exim/conf/bsmtp
  :/etc/exim/conf/DOMAIN/aliases
  End
internal_search_find: file="/etc/exim/conf/tagged"
  type=lsearch key="DOMAIN"
cached data used for lookup of DOMAIN
  in /etc/exim/conf/tagged
lookup yielded: key=KEY url=URL
deny: condition test succeeded

--
Simon Arlott