Gnarwl

apt-get install gnarwl
adduser --system --home /var/lib/gnarwl --no-create-home --gid 8 gnarwl
chown gnarwl: -R /var/lib/gnarwl /etc/gnarwl.cfg

Fichier /etc/postfix/master.cf :

# Gnarwl
gnarwl    unix  -       n       n       -       1       pipe flags=F
  user=gnarwl argv=/usr/bin/gnarwl -c /etc/gnarwl.cfg -a ${nexthop}

Fichier /etc/gnarwl.cfg :

map_sender $sender
map_receiver $recepient
map_subject $subject
map_field $begin vacationStart
map_field $end vacationEnd 
map_field $fullname cn
map_field $deputy vacationForward
server ldap.example.com
port 389
scope sub
login uid=gnarwl,ou=sysaccounts,o=example
password mdpldap
protocol 0
base o=example
queryfilter (&(|(mail=$recepient)(mailAlternateAddress=$recepient))(vacationActive=TRUE))
result vacationInfo
blockfiles /var/lib/gnarwl/block/
umask 0644
blockexpire 48
mta /usr/sbin/sendmail -F $recepient -t $sender
maxreceivers 64
maxheader 512
charset UTF-8
badheaders /var/lib/gnarwl/badheaders.db
blacklist /var/lib/gnarwl/blacklist.db
forceheader /var/lib/gnarwl/header.txt
forcefooter /var/lib/gnarwl/footer.txt
recvheader To Cc
loglevel 2

Fichier /var/lib/gnarwl/header.txt :

From: $fullname <$recepient>
To: $sender
X-mailer: GNARWL
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Subject: Re: $subject

Il suffira ensuite d'envoyer le mail automatiquement sur le transport gnarwl:. Différente solutions existent pour cela :

Le principe : Utiliser un mapping LDAP pour ajouter automatiquement une adresse mail destinatrice en BCC via la directive recipient_bcc_maps. L'adresse mail ajouté sera dans un domaine spécial dont les mails seront destinés au transport gnarwl:

Fichier /etc/postfix/main.cf :

transport_maps = proxy:ldap:gnarwl_transport

ldap_mailbox_vacation_bcc_server_host = ldap0.example.com,ldap1.example.com
ldap_mailbox_vacation_bcc_server_port = 389
ldap_mailbox_vacation_bcc_search_base = o=example
ldap_mailbox_vacation_bcc_timeout = 30
ldap_mailbox_vacation_bcc_query_filter = (&(|(mail=%s)(mailAlternateAddress=%s))(vacationActive=TRUE))
ldap_mailbox_vacation_bcc_result_attribute = uid
ldap_mailbox_vacation_bcc_result_format = %s@autoreponse.example.com
ldap_mailbox_vacation_bcc_expansion_limit = 1
ldap_mailbox_vacation_bcc_scope = sub
ldap_mailbox_vacation_bcc_bind = yes
ldap_mailbox_vacation_bcc_version = 3
ldap_mailbox_vacation_bcc_bind_dn = uid=postfix,ou=sysaccounts,o=example
ldap_mailbox_vacation_bcc_bind_pw = mdpldap

recipient_bcc_maps = ldap:ldap_mailbox_vacation_bcc

gnarwl_transport_server_host = ldap0.example.com,ldap1.example.com
gnarwl_transport_server_port = 389
gnarwl_transport_search_base = o=example
gnarwl_transport_domain = autoreponse.example.com
gnarwl_transport_query_filter = (&(vacationActive=TRUE)(uid=%u))
gnarwl_transport_result_attribute = mail
gnarwl_transport_result_format = gnarwl:%s
gnarwl_transport_expansion_limit = 1
gnarwl_transport_scope = sub
gnarwl_transport_bind = yes
gnarwl_transport_version = 3
gnarwl_transport_cache = no
gnarwl_transport_bind_dn = uid=postfix,ou=sysaccounts,o=example
gnarwl_transport_bind_pw = mdpldap