verify   Début   Suivant   Sommaire   Préc.page.lue   Accueil
Section: Maintenance Commands (8)
Sommaire  



NAME   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
verify - Postfix address verification server  



SYNOPSIS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
verify [generic Postfix daemon options]
 



DESCRIPTION   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
The verify(8) address verification server maintains a record of what recipient addresses are known to be deliverable or undeliverable.

Addresses are verified by injecting probe messages into the Postfix queue. Probe messages are run through all the routing and rewriting machinery except for final delivery, and are discarded rather than being deferred or bounced.

Address verification relies on the answer from the nearest MTA for the specified address, and will therefore not detect all undeliverable addresses.

The verify(8) server is designed to run under control by the Postfix master server. It maintains an optional persistent database. To avoid being interrupted by "postfix stop" in the middle of a database update, the process runs in a separate process group.

The verify(8) server implements the following requests:

update address status text
Update the status and text of the specified address.
query address
Look up the status and text for the specified address. If the status is unknown, a probe is sent and an "in progress" status is returned.
 



SECURITY   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


The address verification server is not security-sensitive. It does
not talk to the network, and it does not talk to local users.
The verify server can run chrooted at fixed low privilege.

The address verification server can be coerced to store unlimited amounts of garbage. Limiting the cache size trades one problem (disk space exhaustion) for another one (poor response time to client requests).

With Postfix version 2.5 and later, the verify(8) server no longer uses root privileges when opening the address_verify_map cache file. The file should now be stored under the Postfix-owned data_directory. As a migration aid, an attempt to open a cache file under a non-Postfix directory is redirected to the Postfix-owned data_directory, and a warning is logged.  




DIAGNOSTICS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
Problems and transactions are logged to syslogd(8).  



BUGS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
The address verification service is suitable only for sites that handle a low mail volume. Verification probes add additional traffic to the mail queue and perform poorly under high load. Servers may blacklist sites that probe excessively, or that probe excessively for non-existent recipient addresses.

If the persistent database ever gets corrupted then the world comes to an end and human intervention is needed. This violates a basic Postfix principle.  




CONFIGURATION PARAMETERS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


Changes to main.cf are not picked up automatically,
as verify(8)
processes are persistent. Use the command "postfix reload" after
a configuration change.

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




CACHE CONTROLS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


address_verify_map (empty)
Optional lookup table for persistent address verification status storage.
address_verify_sender ($double_bounce_sender)
The sender address to use in address verification probes; prior to Postfix 2.5 the default was "postmaster".
address_verify_positive_expire_time (31d)
The time after which a successful probe expires from the address verification cache.
address_verify_positive_refresh_time (7d)
The time after which a successful address verification probe needs to be refreshed.
address_verify_negative_cache (yes)
Enable caching of failed address verification probe results.
address_verify_negative_expire_time (3d)
The time after which a failed probe expires from the address verification cache.
address_verify_negative_refresh_time (3h)
The time after which a failed address verification probe needs to be refreshed.
 



PROBE MESSAGE ROUTING CONTROLS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


By default, probe messages are delivered via the same route
as regular messages.  The following parameters can be used to
override specific message routing mechanisms.
address_verify_relayhost ($relayhost)
Overrides the relayhost parameter setting for address verification probes.
address_verify_transport_maps ($transport_maps)
Overrides the transport_maps parameter setting for address verification probes.
address_verify_local_transport ($local_transport)
Overrides the local_transport parameter setting for address verification probes.
address_verify_virtual_transport ($virtual_transport)
Overrides the virtual_transport parameter setting for address verification probes.
address_verify_relay_transport ($relay_transport)
Overrides the relay_transport parameter setting for address verification probes.
address_verify_default_transport ($default_transport)
Overrides the default_transport parameter setting for address verification probes.
 



MISCELLANEOUS CONTROLS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


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.
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 (postfix)
The mail system name that is prepended to the process name in syslog records, so that "smtpd" becomes, for example, "postfix/smtpd".
 



SEE ALSO   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
smtpd(8), Postfix SMTP server
cleanup(8), enqueue Postfix message
postconf(5), configuration parameters
syslogd(5), system logging
 



README FILES   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


Use "postconf readme_directory" or
"postconf html_directory" to locate this information.

ADDRESS_VERIFICATION_README, address verification howto
 



LICENSE   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


The Secure Mailer license must be distributed with this software.
 



HISTORY   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


This service was introduced with Postfix version 2.1.
 



AUTHOR(S)   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA


 



Sommaire   Début   Suivant   Sommaire   Préc.page.lue   Accueil
NAME
SYNOPSIS
DESCRIPTION
SECURITY
DIAGNOSTICS
BUGS
CONFIGURATION PARAMETERS
CACHE CONTROLS
PROBE MESSAGE ROUTING CONTROLS
MISCELLANEOUS CONTROLS
SEE ALSO
README FILES
LICENSE
HISTORY
AUTHOR(S)

Table des mots clés   Début   Suivant   Sommaire   Préc.page.lue   Accueil
address_verify_default_transport ($default_transport)PROBE MESSAGE ROUTING CONTROLS
address_verify_local_transport ($local_transport)PROBE MESSAGE ROUTING CONTROLS
address_verify_map (empty)CACHE CONTROLS
address_verify_negative_cache (yes)CACHE CONTROLS
address_verify_negative_expire_time (3d)CACHE CONTROLS
address_verify_negative_refresh_time (3h)CACHE CONTROLS
address_verify_positive_expire_time (31d)CACHE CONTROLS
address_verify_positive_refresh_time (7d)CACHE CONTROLS
address_verify_relay_transport ($relay_transport)PROBE MESSAGE ROUTING CONTROLS
address_verify_relayhost ($relayhost)PROBE MESSAGE ROUTING CONTROLS
address_verify_sender ($double_bounce_sender)CACHE CONTROLS
address_verify_transport_maps ($transport_maps)PROBE MESSAGE ROUTING CONTROLS
address_verify_virtual_transport ($virtual_transport)PROBE MESSAGE ROUTING CONTROLS
config_directory (see 'postconf -d' output)MISCELLANEOUS CONTROLS
daemon_timeout (18000s)MISCELLANEOUS CONTROLS
ipc_timeout (3600s)MISCELLANEOUS CONTROLS
process_id (read-only)MISCELLANEOUS CONTROLS
process_name (read-only)MISCELLANEOUS CONTROLS
query addressDESCRIPTION
queue_directory (see 'postconf -d' output)MISCELLANEOUS CONTROLS
syslog_facility (mail)MISCELLANEOUS CONTROLS
syslog_name (postfix)MISCELLANEOUS CONTROLS
update address status textDESCRIPTION



Ce document a été créé par man2html suivi de man2html.pl, le 17/10/2008 17:54:41, en utilisant les pages de 'man'.
 

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