DNSBLOG(8)                                                          DNSBLOG(8)

NAME
       dnsblog - Postfix DNS white/blacklist logger

SYNOPSIS
       dnsblog [generic Postfix daemon options]

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

PROTOCOL
       With each connection, the dnsblog(8) server receives a DNS
       white/blacklist  domain  name  and  an  IP address. If the
       address is listed under the DNS white/blacklist, the  dns-
       blog(8)  server  logs the match and replies with the query
       arguments plus a non-zero status.   Otherwise  it  replies
       with the query arguments 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 white/blacklist domains,  fil-
              ters and weight factors.

       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 was introduced with Postfix version 2.8.

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

                                                                    DNSBLOG(8)