Postfix: emails addressed to multiple smart hosts

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LEARN ABOUT CENTOS

dnsblog

DNSBLOG(8)						      System Manager's Manual							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, IP address, and an ID.  If the  address	is  listed
       under  the  DNS	white/blacklist,  the  dnsblog(8) server logs the match and replies with the query arguments plus an address list with the
       resulting IP addresses separated by whitespace.	Otherwise it replies with the query arguments plus an empty address  list.   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 dnsblog(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, filters 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 directory.

       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)

Red Hat