DNSBLOG(8)                                                          DNSBLOG(8)

NAME
       dnsblog - Postfix DNS blocklist logger

SYNOPSIS
       dnsblog [generic Postfix daemon options]

DESCRIPTION
       The  dnsblog(8)  server implements an ad-hoc DNS blocklist
       lookup service that will eventually be replaced by an  UDP
       client  that  is  built  directly  into  the postscreen(8)
       server.

       With each connection, the dnsblog(8) server receives a DNS
       blocklist domain name and an IP address. If the address is
       listed under the DNS blocklist, the dnsblog(8) server logs
       the match and replies with the query arguments plus a non-
       zero status.  Otherwise it replies with  the  query  argu-
       ments  plus a zero status.  Finally, The dnsblog(8) server
       closes the connection.

DIAGNOSTICS
       Problems and transactions are logged to syslogd(8).

CONFIGURATION PARAMETERS
       Changes to main.cf are picked up  automatically,  as  dns-
       blog(8)  processes  run for only a limited amount of time.
       Use the command "postfix reload" to speed up a change.

       The text below provides  only  a  parameter  summary.  See
       postconf(5) for more details including examples.

       config_directory (see 'postconf -d' output)
              The  default  location  of  the Postfix main.cf and
              master.cf configuration files.

       daemon_timeout (18000s)
              How much time a Postfix daemon process may take  to
              handle  a  request  before  it  is  terminated by a
              built-in watchdog timer.

       postscreen_dnsbl_sites (empty)
              Optional list of DNS blocklist domains.

       ipc_timeout (3600s)
              The time limit for sending or receiving information
              over an internal communication channel.

       process_id (read-only)
              The  process  ID  of  a  Postfix  command or daemon
              process.

       process_name (read-only)
              The process name of a  Postfix  command  or  daemon
              process.

       queue_directory (see 'postconf -d' output)
              The  location of the Postfix top-level queue direc-
              tory.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (see 'postconf -d' output)
              The mail system  name  that  is  prepended  to  the
              process  name  in  syslog  records, so that "smtpd"
              becomes, for example, "postfix/smtpd".

SEE ALSO
       smtpd(8), Postfix SMTP server
       postconf(5), configuration parameters
       syslogd(5), system logging

LICENSE
       The Secure Mailer license must be  distributed  with  this
       software.

HISTORY
       This service is temporary with Postfix version 2.7.

AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

                                                                    DNSBLOG(8)