Adding upstream version 3.4.23.upstream/3.4.23upstream

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

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+Purpose of this document
+========================
+
+This document provides a road map of the Postfix mail system source
+code distribution.  I suggest that you
+
+- take a few minutes to read this file,
+
+- review the RELEASE_NOTES file for incompatible changes,
+
+- and then proceed with the INSTALL instructions.
+
+Introduction
+============
+
+This is the public release of the Postfix mail system. Thank you
+for your interest in this project. Send me a postcard if you like
+it. My postal address is below.
+
+You must read the LICENSE file, if you didn't do so already. A copy
+of the LICENSE must be distributed with every original, modified,
+complete, source, or binary copy of this software or parts thereof.
+I suggest that you keep a copy of the file in /etc/postfix/LICENSE.
+
+Purpose of the Postfix mail system
+==================================
+
+Postfix aims to be an alternative to the widely-used sendmail
+program.
+
+Although IBM supported the Postfix development, it abstains from
+control over its evolution. The goal is to have Postfix installed
+on as many systems as possible. To this end, the software is given
+away with no strings attached to it, so that it can evolve with
+input from and under control by its users.
+
+In other words, IBM releases Postfix only once. I will be around
+to guide its development for a limited time.
+
+On-line resources devoted to the Postfix mail system
+====================================================
+
+Web sites:
+
+    http://www.postfix.org/		current release information
+
+Mail addresses (PLEASE send questions to the mailing list)
+
+    postfix-users@postfix.org		Postfix users mailing list
+
+In order to subscribe to the mailing list, see http://www.postfix.org/.
+
+Acknowledgments
+===============
+
+This release could not have happened without the input from a team
+of competent alpha testers. Their names appear in numerous places
+in the HISTORY file. I appreciate the input from my colleagues at
+the IBM Global Security Analysis Laboratory:  Paul Karger, Dave
+Safford, Douglas Schales, and Leendert van Doorn.  I also appreciate
+the support by Charles Palmer under whose leadership I began this
+project, and who had the privilege to name the software, twice.
+
+Postcards
+=========
+
+If you wish to express your appreciation for the Postfix software,
+you are welcome to send a postcard to:
+
+	Wietse Venema
+	Google
+	111 8th Avenue, 4th floor
+	New York, NY 10011
+	USA
+
+Roadmap of the Postfix source distribution
+==========================================
+
+The RELEASE_NOTES file describes new features, and lists incompatible
+changes with respect to previous Postfix versions.
+
+The INSTALL file provides a step-by-step guide for building and
+installing Postfix on many popular UNIX platforms.
+
+The COMPATIBILITY file lists features that Postfix does or does
+not yet implement, and how well it works with other software.
+
+The HISTORY file gives a detailed log of changes to the software.
+
+Point your browser at html/index.html for Postfix documentation
+and for hyperlinked versions of Postfix manual pages.  Expect
+to see updated versions on-line at http://www.postfix.org/
+
+Point your MANPATH environment variable at the `man' directory (use
+an absolute path) for UNIX-style on-line manual pages.  These pages
+are also available through the HTML interface, which allows you to
+navigate faster.
+
+The PORTING file discusses how to go about porting Postfix to other
+UNIX platforms.
+
+Documentation:
+
+    README_FILES/	Instructions for specific Postfix features
+    html/		HTML format
+    man/		UNIX on-line manual page format
+
+Example files:
+
+    conf/		configuration files, run-time scripts
+    examples/		chroot environments, virtual domains
+
+Library routines:
+
+    src/dns/		DNS client library
+    src/global/		Postfix-specific support routines
+    src/milter/		Postfix Milter (mail filter) client
+    src/tls/		TLS client and server support
+    src/util/		General-purpose support routines
+    src/xsasl/		SASL plug-in API
+
+Command-line utilities:
+
+    src/postalias/	Alias database management
+    src/postcat/	List Postfix queue file
+    src/postconf/	Configuration utility
+    src/postdrop/	Postfix mail submission program
+    src/postfix/	Postfix administrative interface
+    src/postkick/	Postfix IPC for shell scripts
+    src/postlock/	Postfix locking for shell scripts
+    src/postlog/	Postfix logging for shell scripts
+    src/postmap/	Postfix lookup table management
+    src/postmulti/	Postfix multi-instance manager
+    src/postqueue/	Postfix queue control program
+    src/postsuper/	Postfix house keeping program
+    src/sendmail/	Sendmail compatibility interface
+
+Postfix daemons:
+
+    src/anvil/		Connection count/rate limiter
+    src/bounce/		Bounce or defer mail
+    src/cleanup/	Canonicalize and enqueue mail
+    src/discard/	Trivial discard mailer
+    src/dnsblog/	DNS agent for postscreen
+    src/error/		Trivial error mailer
+    src/flush/		Support for ETRN, sendmail -qI, sendmail -qR
+    src/local/		Local delivery
+    src/master/		Postfix resident superserver
+    src/oqmgr/		Old queue manager
+    src/pickup/		Local pickup
+    src/pipe/		Pipe delivery
+    src/postlogd/	Syslog alternative, logs to file or stdout
+    src/postscreen/	Zombie blocker
+    src/proxymap/	Table lookup proxy agent
+    src/qmgr/		Queue manager
+    src/qmqpd/		QMQPD server
+    src/scache/		Postfix SMTP session cache
+    src/showq/		List Postfix queue status
+    src/smtp/		SMTP and LMTP client
+    src/smtpd/		SMTP server
+    src/spawn/		Run non-Postfix server
+    src/tlsmgr/		TLS session keys and random pool
+    src/tlsproxy/	TLS proxy for postscreen and outbound connection reuse
+    src/trivial-rewrite/ Address rewriting and resolving
+    src/verify/		address verification service
+    src/virtual/	virtual mailbox-only delivery agent
+
+Test programs:
+
+    src/fsstone/	Measure file system overhead
+    src/posttls-finger/	Postfix SMTP/LMTP TLS probe utility
+    src/smtpstone/	SMTP and QMQP server torture test
+
+Miscellaneous:
+
+    auxiliary/		Auxiliary software etc.
+    bin/		Postfix command executables
+    conf/		Configuration files, run-time scripts
+    include/		Include files
+    implementation-notes/ Background information
+    lib/		Object libraries
+    libexec/		Postfix daemon executables
+    mantools/		Documentation utilities
+    proto/		Documentation source