Postfix verifica el correo saliente en busca de spam

¿Cómo puedo forzar a Postfix a verificar (y registrar / marcar / etc.) todo el correo saliente en busca de spam?

Solo quiero asegurarme de que estoy haciendo mi parte en mis servidores.

EDITAR : configuración Postfix, según lo solicitado.

main.cf

# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth

smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes

smtpd_recipient_restrictions =
   permit_sasl_authenticated,
   permit_mynetworks,
   reject_unauth_destination

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

alias_maps = hash:/etc/aliases

myhostname = example.com
myorigin = /etc/mailname
mydestination = localhost, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
content_filter = smtp-amavis:[127.0.0.1]:10024

transport_maps = mysql:/etc/postfix/mysql/transport_maps.cf

virtual_mailbox_domains = mysql:/etc/postfix/mysql/virtual_alias_domains.cf
virtual_alias_maps = mysql:/etc/postfix/mysql/virtual_alias_maps.cf


virtual_mailbox_base = /var/mail
virtual_mailbox_maps = mysql:/etc/postfix/mysql/virtual_mailbox_maps.cf
virtual_minimum_uid = 100
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
dovecot_destination_recipient_limit = 1

master.cf

#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       -       -       -       smtpd
submission inet n       -       -       -       -       smtpd
#  -o smtpd_tls_security_level=encrypt
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#smtps     inet  n       -       -       -       -       smtpd
#  -o smtpd_tls_wrappermode=yes
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#628      inet  n       -       -       -       -       qmqpd
pickup    fifo  n       -       -       60      1       pickup
cleanup   unix  n       -       -       -       0       cleanup
qmgr      fifo  n       -       n       300     1       qmgr
#qmgr     fifo  n       -       -       300     1       oqmgr
tlsmgr    unix  -       -       -       1000?   1       tlsmgr
rewrite   unix  -       -       -       -       -       trivial-rewrite
bounce    unix  -       -       -       -       0       bounce
defer     unix  -       -       -       -       0       bounce
trace     unix  -       -       -       -       0       bounce
verify    unix  -       -       -       -       1       verify
flush     unix  n       -       -       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       -       -       -       smtp
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay     unix  -       -       -       -       -       smtp
    -o smtp_fallback_relay=
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       -       -       -       showq
error     unix  -       -       -       -       -       error
retry     unix  -       -       -       -       -       error
discard   unix  -       -       -       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       -       -       -       lmtp
anvil     unix  -       -       -       -       1       anvil
scache    unix  -       -       -       -       1       scache

127.0.0.1:10025     inet    n   -   y   -   -   smtpd
    -o content_filter=
    -o local_recipient_maps=
    -o relay_recipient_maps=
    -o smtpd_restriction_classes=
    -o smtpd_helo_restrictions=
    -o smtpd_sender_restrictions=
    -o smtpd_recipient_restrictions=permit_mynetworks,reject

    -o mynetworks=127.0.0.0/8
    -o strict_rfc821_envelopes=yes
    -o smtpd_error_sleep_time=0
    -o smtpd_soft_error_limit=1001
    -o smtpd_hard_error_limit=100

smtp-amavis unix -  -   y   -   2   smtp
    -o smtp_data_done_timeout=1200
    -o disable_dns_lookups=yes
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
#
# See the Postfix UUCP_README file for configuration details.
#
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix  -   n   n   -   2   pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  ${nexthop} ${user}

dovecot   unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${recipient}

mysql / transport_maps.cf

user = user
password = password
hosts = 127.0.0.1

dbname = postfix

query = SELECT target FROM transports WHERE hostname = '%d' AND active = 1

mysql / virtual_alias_domains.cf

user = user
password = password
hosts = 127.0.0.1

dbname = postfix
select_field = domain
table = domains
where_field = domain
additional_conditions = AND active = 1

mysql / virtual_alias_maps.cf

user = user
password = password
hosts = 127.0.0.1

dbname = postfix
select_field = forward
table = aliases
where_field = source
additional_conditions = AND active = 1

mysql / virtual_mailbox_maps.cf

user = user
password = password
hosts = 127.0.0.1

dbname = postfix

query = SELECT mailbox_path FROM users WHERE address = '%s' AND active = 1

A continuación se muestra un "apéndice" de configuración para verificar también los mensajes salientes.

En main.cf:

smtpd_sender_restrictions = 
   check_client_access cidr:/etc/postfix/internal_clients_filter

Y: / etc / postfix / internal_clients_filter

192.168.0.0/24 FILTER smtp:[127.0.0.1]:12501
10.0.0.0/24 FILTER smtp:[127.0.0.1]:12501

(También puede hacer esto de otras maneras para usuarios registrados, ip, desde etc.)

Use un banco de pólizas en Amavisd-new:

$interface_policy{'12501'} = 'INTERNAL'; 
$policy_bank{'INTERNAL'} = {  # mail originating from clients in cidr:/etc/postfix/internal_clients_filter
  bypass_spam_checks_maps   => [0],  # spam-check outgoing mail 
  bypass_banned_checks_maps => [0],  # banned-check outgoing mail 
  bypass_header_checks_maps => [0],  # header-check outgoing mail  
  forward_method => 'smtp:[127.0.0.1]:12502', # relay to Postfix listener on port 12502
};

Y la ruta de reinyección en postfix:

127.0.0.1:12502 inet    n    -    n    -    -    smtpd
    -o smtpd_recipient_restrictions=permit_mynetworks,reject
    -o smtpd_restriction_classes=
    -o smtpd_delay_reject=no
    -o smtpd_client_restrictions=
    -o smtpd_helo_restrictions=
    -o smtpd_sender_restrictions=
    -o mynetworks=127.0.0.0/8
    -o smtpd_data_restrictions
    -o smtpd_end_of_data_restrictions=
    -o local_header_rewrite_clients=
    -o smtpd_error_sleep_time=0
    -o smtpd_soft_error_limit=1001
    -o smtpd_hard_error_limit=1000
    -o smtpd_client_connection_count_limit=0
    -o smtpd_client_connection_rate_limit=0
    -o smtpd_milters=
    -o local_recipient_maps=
    -o relay_recipient_maps=
    -o receive_override_options=no_header_body_checks,no_unknown_recipient_checks,no_address_mappings

Esta es una pregunta antigua, pero pensé que compartiría alguna configuración que permita el uso de un filtro Procmail saliente. Primero, en master.cf:

submission inet n       -       n       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=may
  -o smtpd_sasl_auth_enable=yes
  -o broken_sasl_auth_clients=yes
  -o smtpd_client_restrictions=permit_mynetworks,permit_sasl_authenticated,reject
  -o smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject_unauth_destination
  -o content_filter=procmail-outbound

procmail-outbound unix  -       n       n       -       -       pipe
  flags=Rq user=mail argv=/usr/bin/procmail -t -m SENDER=${sender} RECIPIENT=${recipient} /etc/procmail/outbound.rc

y luego puede ejecutar cualquier receta de procmail que necesite outbound.rcantes de reinyectar el mensaje procesado con sendmailel siguiente ejemplo de receta:

# Send mail
:0 w
| /usr/bin/sendmail -G -i -f $SENDER $RECIPIENT

(Tenga en cuenta que el ejemplo acepta correo en el servicio de envío (puerto 587) en lugar del smtpservicio para retransmisión y entrega).

Sus clientes envían correo usando un servidor smtp, presumiblemente ese es el servidor postfix.

El correo saliente pasa a través del transporte smtp de Postfix, y la configuración anterior lo pasa todo a través de amavisd a través de content_filter, por lo que creo que su correo saliente ya se está procesando.

Te sugiero que pruebes para satisfacerte si este es el caso.

Si el servidor no está muy ocupado, debe seguir su registro de correo y ver qué sucede cuando envía un mensaje de prueba que contiene la cadena GTUBE ( XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X). Amavisd / spamassassin debería captar el mensaje. Si es así, sabes que tu correo se está escaneando al salir.

Si define content_filter en su main.cf, el filtro se aplicará en cualquier interfaz entrante y saliente (smtp, smtps, envío).

content_filter=clamav:{{ HOST_ALIAS_CLAMAV }}:{{ CLAMAV_SERVER_PORT }}

Asegúrese de establecer -o content_filter=en la sección del proceso clamav para no obtener un bucle infinito.

0.0.0.0:{{ CLAMAV_FORWARD_PORT }} inet  n -       n       -       16      smtpd
    -o content_filter=
    ...