Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+PPoossttffiixx ++ MMaaiillddrroopp HHoowwttoo
+
+-------------------------------------------------------------------------------
+
+IInnttrroodduuccttiioonn
+
+This document discusses various options to plug the maildrop delivery agent
+into Postfix:
+
+  * Direct delivery without the local delivery agent
+  * Indirect delivery via the local delivery agent
+  * Credits
+
+DDiirreecctt ddeelliivveerryy wwiitthhoouutt tthhee llooccaall ddeelliivveerryy aaggeenntt
+
+Postfix can be configured to deliver mail directly to maildrop, without using
+the local(8) delivery agent as an intermediate. This means that you do not get
+local aliases(5) expansion or $HOME/.forward file processing. You would
+typically do this for hosted domains with recipients that don't have UNIX home
+directories.
+
+The following example shows how to use maildrop for some.domain and for
+someother.domain. The example comes in two parts.
+
+Part 1 describes changes to the main.cf file:
+
+     1 /etc/postfix/main.cf:
+     2     maildrop_destination_recipient_limit = 1
+     3     virtual_mailbox_domains = some.domain someother.domain
+     4     virtual_transport = maildrop
+     5     virtual_mailbox_maps = hash:/etc/postfix/virtual_mailbox
+     6     virtual_alias_maps = hash:/etc/postfix/virtual_alias
+     7
+     8 /etc/postfix/virtual_mailbox:
+     9     user1@some.domain        ...text here does not matter...
+    10     user2@some.domain        ...text here does not matter...
+    11     user3@someother.domain   ...text here does not matter...
+    12
+    13 /etc/postfix/virtual_alias:
+    14     postmaster@some.domain           postmaster
+    15     postmaster@someother.domain      postmaster
+
+  * Line 2 is needed so that Postfix will provide one recipient at a time to
+    the maildrop delivery agent.
+
+  * Line 3 informs Postfix that some.domain and someother.domain are so-called
+    virtual mailbox domains. Instead of listing the names in main.cf you can
+    also list them in a file; see the virtual_mailbox_domains documentation for
+    details.
+
+  * Line 4 specifies that mail for some.domain and someother.domain should be
+    delivered by the maildrop delivery agent.
+
+  * Lines 5 and 8-11 specify what recipients the Postfix SMTP server should
+    receive mail for. This prevents the mail queue from becoming clogged with
+    undeliverable messages. Specify an empty value ("virtual_mailbox_maps =")
+    to disable this feature.
+
+  * Lines 6 and 13-15 redirect mail for postmaster to the local postmaster. RFC
+    821 requires that every domain has a postmaster address.
+
+The vmail userid as used below is the user that maildrop should run as. This
+would be the owner of the virtual mailboxes if they all have the same owner. If
+maildrop is suid (see maildrop documentation), then maildrop will change to the
+appropriate owner to deliver the mail.
+
+Note: Do not use the postfix user as the maildrop user.
+
+Part 2 describes changes to the master.cf file:
+
+    /etc/postfix/master.cf:
+        maildrop  unix  -       n       n       -       -       pipe
+          flags=ODRhu user=vmail argv=/path/to/maildrop -d ${recipient}
+
+The pipe(8) manual page gives a detailed description of the above command line
+arguments, and more.
+
+If you want to support user+extension@domain style addresses, use the following
+instead:
+
+    /etc/postfix/master.cf:
+        maildrop  unix  -       n       n       -       -       pipe
+          flags=ODRhu user=vmail argv=/path/to/maildrop
+          -d ${user}@${domain} ${extension} ${recipient} ${user} ${nexthop}
+
+The mail is delivered to ${user}@${domain} (search key for maildrop userdb
+lookup). The ${extension} and the other address components are available to
+maildrop rules as $1, $2, $3, ... and can be omitted from master.cf or ignored
+by maildrop when not needed.
+
+With Postfix 2.4 and earlier, use ${nexthop} instead of ${domain}.
+
+IInnddiirreecctt ddeelliivveerryy vviiaa tthhee llooccaall ddeelliivveerryy aaggeenntt
+
+Postfix can be configured to deliver mail to maildrop via the local delivery
+agent. This is slightly less efficient than the "direct" approach discussed
+above, but gives you the convenience of local aliases(5) expansion and
+$HOME/.forward file processing. You would typically use this for domains that
+are listed in mydestination and that have users with a UNIX system account.
+
+To configure maildrop delivery for all UNIX system accounts:
+
+    /etc/postfix/main.cf:
+        mailbox_command = /path/to/maildrop -d ${USER}
+
+Note: ${USER} is spelled in upper case.
+
+To enable maildrop delivery for specific users only, you can use the Postfix
+local(8) delivery agent's mailbox_command_maps feature:
+
+    /etc/postfix/main.cf:
+        mailbox_command_maps = hash:/etc/postfix/mailbox_commands
+
+    /etc/postfix/mailbox_commands:
+        you    /path/to/maildrop -d ${USER}
+
+Maildrop delivery for specific users is also possible by invoking it from the
+user's $HOME/.forward file:
+
+    /home/you/.forward:
+        "|/path/to/maildrop -d ${USER}"
+
+CCrreeddiittss
+
+  * The original text was kindly provided by Russell Mosemann.
+  * Victor Duchovni provided tips for supporting user+foo@domain addresses.
+  * Tonni Earnshaw contributed text about delivery via the local(8) delivery
+    agent.
+