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Rename

<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title> Postfix manual - verify(8) </title>
</head> <body> <pre>
VERIFY(8) System Manager's Manual VERIFY(8)

NAME
 verify - Postfix address verification server

SYNOPSIS
 verify [generic Postfix daemon options]

DESCRIPTION
 The <a href="verify.8.html">verify(8)</a> 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 <a href="verify.8.html">verify(8)</a> 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 <a href="verify.8.html">verify(8)</a> 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
 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 expiry time trades one problem
       (disk space exhaustion) for another one (poor response time  to  client
       requests).

With Postfix version 2.5 and later, the <a href="verify.8.html">verify(8)</a> server no longer uses
 root privileges when opening the <a href="postconf.5.html#address_verify_map">address_verify_map</a> cache file. The
 file should now be stored under the Postfix-owned <a href="postconf.5.html#data_directory">data_directory</a>. As a
 migration aid, an attempt to open a cache file under a non-Postfix
 directory is redirected to the Postfix-owned <a href="postconf.5.html#data_directory">data_directory</a>, and a
 warning is logged.

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

BUGS
 Address verification probe messages add additional traffic to the mail
 queue. Recipient verification may cause an increased load on
 down-stream servers in the case of a dictionary attack or a flood of
 backscatter bounces. Sender address verification may cause your site
 to be blacklisted by some providers.

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
 Changes to <a href="postconf.5.html">main.cf</a> are not picked up automatically, as <a href="verify.8.html">verify(8)</a> pro‐
 cesses are long-lived. Use the command "postfix reload" after a config‐
 uration change.

The text below provides only a parameter summary. See <a href="postconf.5.html">postconf(5)</a> for
 more details including examples.

PROBE MESSAGE CONTROLS
 <a href="postconf.5.html#address_verify_sender">address_verify_sender</a> ($<a href="postconf.5.html#double_bounce_sender">double_bounce_sender</a>)
 The sender address to use in address verification probes; prior
 to Postfix 2.5 the default was "postmaster".

Available with Postfix 2.9 and later:

<a href="postconf.5.html#address_verify_sender_ttl">address_verify_sender_ttl</a> (0s)
 The time between changes in the time-dependent portion of
 address verification probe sender addresses.

CACHE CONTROLS
 <a href="postconf.5.html#address_verify_map">address_verify_map</a> (see 'postconf -d' output)
 Lookup table for persistent address verification status storage.

<a href="postconf.5.html#address_verify_positive_expire_time">address_verify_positive_expire_time</a> (31d)
 The time after which a successful probe expires from the address
 verification cache.

<a href="postconf.5.html#address_verify_positive_refresh_time">address_verify_positive_refresh_time</a> (7d)
 The time after which a successful address verification probe
 needs to be refreshed.

<a href="postconf.5.html#address_verify_negative_cache">address_verify_negative_cache</a> (yes)
 Enable caching of failed address verification probe results.

<a href="postconf.5.html#address_verify_negative_expire_time">address_verify_negative_expire_time</a> (3d)
 The time after which a failed probe expires from the address
 verification cache.

<a href="postconf.5.html#address_verify_negative_refresh_time">address_verify_negative_refresh_time</a> (3h)
 The time after which a failed address verification probe needs
 to be refreshed.

Available with Postfix 2.7 and later:

<a href="postconf.5.html#address_verify_cache_cleanup_interval">address_verify_cache_cleanup_interval</a> (12h)
 The amount of time between <a href="verify.8.html">verify(8)</a> address verification data‐
 base cleanup runs.

PROBE MESSAGE ROUTING CONTROLS
 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.

<a href="postconf.5.html#address_verify_relayhost">address_verify_relayhost</a> ($<a href="postconf.5.html#relayhost">relayhost</a>)
 Overrides the <a href="postconf.5.html#relayhost">relayhost</a> parameter setting for address verifica‐
 tion probes.

<a href="postconf.5.html#address_verify_transport_maps">address_verify_transport_maps</a> ($<a href="postconf.5.html#transport_maps">transport_maps</a>)
 Overrides the <a href="postconf.5.html#transport_maps">transport_maps</a> parameter setting for address veri‐
 fication probes.

<a href="postconf.5.html#address_verify_local_transport">address_verify_local_transport</a> ($<a href="postconf.5.html#local_transport">local_transport</a>)
 Overrides the <a href="postconf.5.html#local_transport">local_transport</a> parameter setting for address ver‐
 ification probes.

<a href="postconf.5.html#address_verify_virtual_transport">address_verify_virtual_transport</a> ($<a href="postconf.5.html#virtual_transport">virtual_transport</a>)
 Overrides the <a href="postconf.5.html#virtual_transport">virtual_transport</a> parameter setting for address
 verification probes.

<a href="postconf.5.html#address_verify_relay_transport">address_verify_relay_transport</a> ($<a href="postconf.5.html#relay_transport">relay_transport</a>)
 Overrides the <a href="postconf.5.html#relay_transport">relay_transport</a> parameter setting for address ver‐
 ification probes.

<a href="postconf.5.html#address_verify_default_transport">address_verify_default_transport</a> ($<a href="postconf.5.html#default_transport">default_transport</a>)
 Overrides the <a href="postconf.5.html#default_transport">default_transport</a> parameter setting for address
 verification probes.

Available in Postfix 2.3 and later:

<a href="postconf.5.html#address_verify_sender_dependent_relayhost_maps">address_verify_sender_dependent_relayhost_maps</a> ($sender_depen‐
 dent_relayhost_maps)
 Overrides the <a href="postconf.5.html#sender_dependent_relayhost_maps">sender_dependent_relayhost_maps</a> parameter setting
 for address verification probes.

Available in Postfix 2.7 and later:

<a href="postconf.5.html#address_verify_sender_dependent_default_transport_maps">address_verify_sender_dependent_default_transport_maps</a> ($sender_depen‐
 dent_default_transport_maps)
 Overrides the <a href="postconf.5.html#sender_dependent_default_transport_maps">sender_dependent_default_transport_maps</a> parameter
 setting for address verification probes.

SMTPUTF8 CONTROLS
 Preliminary SMTPUTF8 support is introduced with Postfix 3.0.

<a href="postconf.5.html#smtputf8_autodetect_classes">smtputf8_autodetect_classes</a> (sendmail, verify)
 Detect that a message requires SMTPUTF8 support for the speci‐
 fied mail origin classes.

MISCELLANEOUS CONTROLS
 <a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)
 The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con‐
 figuration files.

<a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)
 How much time a Postfix daemon process may take to handle a
 request before it is terminated by a built-in watchdog timer.

<a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)
 The time limit for sending or receiving information over an
 internal communication channel.

<a href="postconf.5.html#process_id">process_id</a> (read-only)
 The process ID of a Postfix command or daemon process.

<a href="postconf.5.html#process_name">process_name</a> (read-only)
 The process name of a Postfix command or daemon process.

<a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)
 The location of the Postfix top-level queue directory.

<a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)
 The syslog facility of Postfix logging.

<a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)
 The mail system name that is prepended to the process name in
 syslog records, so that "smtpd" becomes, for example, "post‐
 fix/smtpd".

SEE ALSO
 <a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
 <a href="cleanup.8.html">cleanup(8)</a>, enqueue Postfix message
 <a href="postconf.5.html">postconf(5)</a>, configuration parameters
 syslogd(5), system logging

README FILES
 <a href="ADDRESS_VERIFICATION_README.html">ADDRESS_VERIFICATION_README</a>, address verification howto

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

HISTORY
 This service was introduced with Postfix version 2.1.

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

Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

VERIFY(8)
</pre> </body> </html>