2002-12-24 22:39:42 +03:00
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Introduction
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============
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As of Postfix version 2.0, the Postfix SMTP server now rejects mail
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for recipients in $mydestination domains that it does not know about.
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This feature was optional with previous Postfix versions.
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The benefit is that this keeps undeliverable mail out of your queue.
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The downside is that it may cause mail to be rejected when you
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upgrade from a Postfix system that was not configured to reject
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mail for unknown local recipients.
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This document describes what steps you may need to take in order
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to not have Postfix reject mail incorrectly.
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For safety's sake, if you upgrade from a Postfix version that did
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not use this feature, the Postfix SMTP server replies with a 450
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(try again later) status code for users it does not know about.
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Configuring the local_recipient_maps parameter
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==============================================
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The local_recipient_maps parameter specifies lookup tables with
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all names or addresses of local recipients. A recipient address is
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local when the address domain matches $mydestination or $inet_interfaces.
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2003-03-08 22:05:29 +03:00
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The right-hand side of the lookup tables is conveniently ignored.
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In the left-hand side, specify a bare username, an @domain.tld
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wild-card, or specify a user@domain.tld address.
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2002-12-24 22:39:42 +03:00
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If the local_recipient_maps parameter value is non-empty, then the
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SMTP server will reject for an unknown local recipient mail with
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"User unknown in local recipient table".
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To turn off unknown local recipient rejects by the SMTP server, specify:
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/etc/postfix/main.cf:
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local_recipient_maps =
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That is, an empty value. With this setting, the Postfix SMTP server
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will not reject mail with "User unknown in local recipient table".
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The default setting assumes that you use the default Postfix local
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delivery agent for local delivery, where recipients are either UNIX
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accounts or local aliases:
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/etc/postfix/main.cf:
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2003-03-08 22:05:29 +03:00
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local_recipient_maps = proxy:unix:passwd.byname $alias_maps
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2002-12-24 22:39:42 +03:00
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You need to update the local_recipient_maps setting if one of the
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following is true:
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1 - You define your $mydestination domain recipients in files other
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than /etc/passwd or /etc/aliases.
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For example, you define $mydestination domain recipients in the
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$virtual_mailbox_maps files. In that case, you specify your local
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recipients as follows:
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/etc/postfix/main.cf:
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local_recipient_maps = $virtual_mailbox_maps
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For non-Postfix delivery agents (i.e. not "local" or "virtual"),
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see further down this document.
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2 - You run the Postfix SMTP server chrooted (specified in master.cf).
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On many systems you will have to copy the passwd file into the
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chroot environment.
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For example, on 4.4 BSD systems one would do the following:
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# mkdir /var/spool/postfix/etc
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# cp /etc/pwd.db /var/spool/postfix/etc
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On other systems one would do:
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# mkdir /var/spool/postfix/etc
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# cp /etc/pwd.db /var/spool/postfix/etc
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You may also have to copy /etc/nsswitch.conf, as well as files
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that are referenced by /etc/nsswitch.conf, but that is unlikely.
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The Postfix SMTP server has a safety net in place in case of a
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missing or inaccessible passwd file and will reply with a 450
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status code (try again) instead of losing your mail. Watch your
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maillog file for the obvious error messages.
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3 - You redefined the local delivery agent in master.cf, or you
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redefined the "local_transport" setting in main.cf, so that
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mail for $mydestination domain recipients is delivered by
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something else than the default Postfix local delivery agent.
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Your local_recipient_maps setting needs to specify a database
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that lists all the known user names or addresses for that
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delivery agent. For example, if you deliver users in $mydestination
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domains via the virtual delivery agent, specify:
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/etc/postfix/main.cf
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local_recipient_maps = $virtual_mailbox_maps
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Your user database will be searched for the user@domain address
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as well as for the bare username.
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4 - You use the mailbox_transport or fallback_transport feature of
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the Postfix local delivery agent in order to deliver mail non-UNIX
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accounts.
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You need to add the database that lists the non-UNIX users:
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/etc/postfix/main.cf
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2003-03-08 22:05:29 +03:00
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local_recipient_maps = unix:passwd.byname, $alias_maps,
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2002-12-24 22:39:42 +03:00
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<the database with non-UNIX accounts>
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Your database will be searched for the user@domain address as
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well as for the bare username.
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5 - You use the luser_relay feature of the Postfix local delivery agent.
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In this case, you must disable the local_recipient_maps feature
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completely, so that Postfix accepts mail for all local addresses:
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/etc/postfix/main.cf
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local_recipient_maps =
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