source: server/mail/postfix.xml@ c6514f57

ken/TL2024 lazarus trunk
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1<?xml version="1.0" encoding="UTF-8"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6
7 <!-- editors: upstream postfix is ftp only, some of the mirrors offer
8 https - http://www.porcupine.org/mirmon/postfix-source.html lists the
9 mirror status, some of the mirrors shown as http are actually https -->
10 <!ENTITY postfix-download-http "https://ghostarchive.org/postfix/postfix-release/official/postfix-&postfix-version;.tar.gz">
11 <!ENTITY postfix-download-ftp " ">
12 <!ENTITY postfix-md5sum "ae12d4dfc965a74a691a22ace14e7207">
13 <!ENTITY postfix-size "4.6 MB">
14 <!ENTITY postfix-buildsize "208 MB">
15 <!ENTITY postfix-time "0.1 SBU (Using parallelism=4)">
16]>
17
18<sect1 id="postfix" xreflabel="Postfix-&postfix-version;">
19 <?dbhtml filename="postfix.html"?>
20
21
22 <title>Postfix-&postfix-version;</title>
23
24 <indexterm zone="postfix">
25 <primary sortas="a-Postfix">Postfix</primary>
26 </indexterm>
27
28 <sect2 role="package">
29 <title>Introduction to Postfix</title>
30
31 <para>
32 The <application>Postfix</application> package contains a Mail Transport
33 Agent (MTA). This is useful for sending email to other users of your host
34 machine. It can also be configured to be a central mail server for your
35 domain, a mail relay agent or simply a mail delivery agent to your local
36 Internet Service Provider.
37 </para>
38
39 &lfs121_checked;
40
41 <bridgehead renderas="sect3">Package Information</bridgehead>
42 <itemizedlist spacing="compact">
43 <listitem>
44 <para>
45 Download (HTTP): <ulink url="&postfix-download-http;"/>
46 </para>
47 </listitem>
48 <listitem>
49 <para>
50 Download (FTP): <ulink url="&postfix-download-ftp;"/>
51 </para>
52 </listitem>
53 <listitem>
54 <para>
55 Download MD5 sum: &postfix-md5sum;
56 </para>
57 </listitem>
58 <listitem>
59 <para>
60 Download size: &postfix-size;
61 </para>
62 </listitem>
63 <listitem>
64 <para>
65 Estimated disk space required: &postfix-buildsize;
66 </para>
67 </listitem>
68 <listitem>
69 <para>
70 Estimated build time: &postfix-time;
71 </para>
72 </listitem>
73 </itemizedlist>
74<!--
75 <bridgehead renderas="sect3">Additional Downloads</bridgehead>
76 <itemizedlist spacing="compact">
77 <listitem>
78 <para>
79 Required patch:
80 <ulink url="&patch-root;/postfix-&postfix-version;-glibc230_fix-1.patch"/>
81 </para>
82 </listitem>
83 </itemizedlist>
84-->
85 <bridgehead renderas="sect3">Postfix Dependencies</bridgehead>
86
87 <bridgehead renderas="sect4">Recommended</bridgehead>
88 <para role="recommended">
89 <xref linkend="cyrus-sasl"/>,
90 <xref linkend="libnsl"/>, and
91 <xref linkend="lmdb"/>
92 </para>
93
94 <bridgehead renderas="sect4">Optional</bridgehead>
95 <para role="optional">
96 <xref linkend="icu"/> for Email Address Internationalization (SMTPUTF8) support,
97 <xref linkend="mariadb"/> or <ulink url="https://www.mysql.com/">MySQL</ulink>,
98 <xref linkend="openldap"/>,
99 <xref linkend="pcre2"/>,
100 <xref linkend="postgresql"/>,
101 <xref linkend="sqlite"/>,
102 &berkeley-db;, and
103 <ulink url="https://cr.yp.to/cdb.html">CDB</ulink> or
104 <ulink url="https://www.corpit.ru/mjt/tinycdb.html">TinyCDB</ulink>
105 </para>
106
107 <para>
108 Note that <application>SQLite</application>,
109 <application>MySQL</application>, <application>PostgreSQL</application>
110 and <application>CDB</application> are only useful if there is a known
111 need for them.
112 </para>
113
114 <para condition="html" role="usernotes">
115 Editor Notes: <ulink url="&blfs-wiki;/postfix"/>
116 </para>
117 </sect2>
118
119 <sect2 role="installation">
120 <title>Installation of Postfix</title>
121
122 <sect3>
123 <title>Adding Users and Groups</title>
124
125 <para>
126 Before you compile the program, you need to create users and groups that
127 will be expected to be in place during the installation. Add the users
128 and groups with the following commands issued by the
129 <systemitem class="username">root</systemitem> user:
130 </para>
131
132<screen role="root"><userinput>groupadd -g 32 postfix &amp;&amp;
133groupadd -g 33 postdrop &amp;&amp;
134useradd -c "Postfix Daemon User" -d /var/spool/postfix -g postfix \
135 -s /bin/false -u 32 postfix &amp;&amp;
136chown -v postfix:postfix /var/mail</userinput></screen>
137 </sect3>
138
139 <sect3>
140 <title>Configuring the Build</title>
141
142 <para>
143 The README files are formatted to be read with a pager like
144 <application>less</application> or <application>more</application>.
145 If you want to use a text editor, make them legible with the
146 following sed:
147 </para>
148
149<screen><userinput>sed -i 's/.\x08//g' README_FILES/*</userinput></screen>
150
151 <para>
152 The <application>Postfix</application> source tree does not contain a
153 <filename>configure</filename> script, rather the makefile in the
154 top-level directory contains a <option>makefiles</option> target that
155 regenerates all the other makefiles in the build tree. If you wish to
156 use additional software such as a database back-end for virtual users,
157 or TLS/SSL authentication, you will need to regenerate the makefiles
158 using one or more of the appropriate <envar>CCARGS</envar> and
159 <envar>AUXLIBS</envar> settings listed below.
160 </para>
161
162 <note>
163 <para>
164 For all variants of the CCARGS you should ensure that -DNO_NIS is
165 specified so that the build does not attempt to access an rpcsvc
166 header which do not exist in BLFS. If &berkeley-db; is
167 not installed, -DNO_DB needs to be specified as well.
168 </para>
169 </note>
170
171 <para>
172 For more details read the readme files.
173 </para>
174
175 <sect4>
176 <title>Cyrus-SASL</title>
177
178 <para>
179 To use <application>Cyrus-SASL</application> with
180 <application>Postfix</application>, use the following arguments:
181 </para>
182
183<screen><literal>CCARGS="-DNO_NIS -DNO_DB \
184 -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I/usr/include/sasl"
185AUXLIBS='-lsasl2'</literal></screen>
186 </sect4>
187
188 <sect4>
189 <title>LMDB</title>
190 <para>
191 To use <application>LMDB</application> with
192 <application>Postfix</application>, use the following arguments:
193 </para>
194
195<screen><literal>CCARGS='-DNO_NIS -DNO_DB -DHAS_LMDB'
196AUXLIBS_LMDB='-llmdb'</literal></screen>
197 </sect4>
198
199 <sect4>
200 <title>OpenLDAP</title>
201
202 <para>
203 To use <application>OpenLDAP</application> with
204 <application>Postfix</application>, use the following arguments:
205 </para>
206
207<screen><literal>CCARGS='-DNO_NIS -DNO_DB -DHAS_LDAP'
208AUXLIBS_LDAP='-lldap -llber'</literal></screen>
209
210 </sect4>
211
212 <sect4>
213 <title>Sqlite</title>
214
215 <para>
216 To use <application>Sqlite</application> with
217 <application>Postfix</application>, use the following arguments:
218 </para>
219
220<screen><literal>CCARGS='-DNO_NIS -DNO_DB -DHAS_SQLITE'
221AUXLIBS_SQLITE='-lsqlite3 -lpthread'</literal></screen>
222
223 </sect4>
224
225 <sect4>
226 <title>MySQL</title>
227
228 <para>
229 To use <application>MySQL</application> with
230 <application>Postfix</application>, use the following arguments:
231 </para>
232
233<screen><literal>CCARGS='-DNO_NIS -DNO_DB -DHAS_MYSQL -I/usr/include/mysql'
234AUXLIBS_MYSQL='-lmysqlclient -lz -lm'</literal></screen>
235
236 </sect4>
237
238 <sect4>
239 <title>PostgreSQL</title>
240
241 <para>
242 To use <application>PostgreSQL</application> with
243 <application>Postfix</application>, use the following arguments:
244 </para>
245
246<screen><literal>CCARGS='-DNO_NIS -DNO_DB -DHAS_PGSQL -I/usr/include/postgresql'
247AUXLIBS_PGSQL='-lpq -lz -lm'</literal></screen>
248
249 </sect4>
250
251 <sect4>
252 <title>CDB/TinyCDB</title>
253
254 <para>
255 To use <application>CDB</application> or
256 <application>TinyCDB</application> with
257 <application>Postfix</application>, use the following arguments:
258 </para>
259
260<screen><literal>CCARGS='-DNO_NIS -DNO_DB -DHAS_CDB'
261AUXLIBS_CDB='<replaceable>&lt;/path/to/CDB&gt;</replaceable>/libcdb.a'</literal></screen>
262
263 </sect4>
264
265 <sect4>
266 <title>StartTLS Authentication</title>
267
268 <para>
269 To use <application>OpenSSL</application> with
270 <application>Postfix</application>, use the following arguments:
271 </para>
272
273<screen><literal>CCARGS='-DNO_NIS -DNO_DB -DUSE_TLS -I/usr/include/openssl/'
274AUXLIBS='-lssl -lcrypto'</literal></screen>
275 </sect4>
276
277 </sect3>
278
279 <sect3>
280 <title>Installing Postfix</title>
281
282 <para>
283 Adjust the following according to your needs. For example,
284 if you have <application>Cyrus SASL</application> and
285 <application>LMDB</application>,
286 install <application>Postfix</application> by running the following
287 commands:
288 </para>
289
290<screen><userinput>make CCARGS="-DNO_NIS -DNO_DB -DUSE_TLS -I/usr/include/openssl/ \
291 -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I/usr/include/sasl \
292 -DHAS_LMDB" \
293 AUXLIBS="-lssl -lcrypto -lsasl2" \
294 AUXLIBS_LMDB="-llmdb" \
295 makefiles &amp;&amp;
296make</userinput></screen>
297
298 <!-- There is a test suite, but it fails a lot. It seems to need
299 the host to be specifically setup for the tests.
300 Run with `make tests' and `make root_tests' -->
301 <para>
302 This package does not come with a useful test suite.
303 </para>
304
305 <para>
306 Now, as the <systemitem class="username">root</systemitem> user:
307 </para>
308
309<!-- dev note: sh postfix-install -non-interactive install_root=<DESTDIR> ... -->
310
311<screen role="root"><userinput>sh postfix-install -non-interactive \
312 daemon_directory=/usr/lib/postfix \
313 manpage_directory=/usr/share/man \
314 html_directory=/usr/share/doc/postfix-&postfix-version;/html \
315 readme_directory=/usr/share/doc/postfix-&postfix-version;/readme</userinput></screen>
316
317 </sect3>
318
319 </sect2>
320
321 <sect2 role="commands">
322 <title>Command Explanations</title>
323
324 <para>
325 <command>make makefiles</command>: This command rebuilds the makefiles
326 throughout the source tree to use the options contained in the
327 <envar>CCARGS</envar> and <envar>AUXLIBS</envar> variables.
328 </para>
329
330 <para>
331 <command>sh postfix-install -non-interactive</command>: This keeps the
332 install script from asking any questions, thereby accepting default
333 destination directories in all but the few cases. If the
334 <option>html_directory</option> and <option>readme_directory</option>
335 options are not set then the documentation will not be installed.
336 </para>
337
338 <para>
339 <option>CCARGS="-DNO_EAI ..."</option>: this will turn off SMTPUTF8
340 support, for example if the rest of your email address infrastructure
341 cannot handle UTF-8 email addresses and message header values.
342 </para>
343
344 </sect2>
345
346 <sect2 role="configuration">
347 <title>Configuring Postfix</title>
348
349 <sect3 id="postfix-config">
350 <title>Config Files</title>
351
352 <para>
353 <filename>/etc/aliases</filename>,
354 <filename>/etc/postfix/main.cf</filename>, and
355 <filename>/etc/postfix/master.cf</filename>
356 </para>
357
358 <indexterm zone="postfix postfix-config">
359 <primary sortas="e-etc-aliases">/etc/aliases</primary>
360 </indexterm>
361
362 <indexterm zone="postfix postfix-config">
363 <primary sortas="e-etc-postfix-star">/etc/postfix/*</primary>
364 </indexterm>
365
366 </sect3>
367
368 <sect3>
369 <title>Configuration Information</title>
370
371 <para>
372 Create (or append to an existing) <filename>/etc/aliases</filename>
373 with the following command. Change
374 <replaceable>&lt;LOGIN&gt;</replaceable> to your non-root login
375 identity so mail addressed to
376 <systemitem class="username">root</systemitem> can be forwarded to you.
377 As the <systemitem class="username">root</systemitem> user:
378 </para>
379
380<screen role="root"><userinput>cat &gt;&gt; /etc/aliases &lt;&lt; "EOF"
381<literal># Begin /etc/aliases
382
383MAILER-DAEMON: postmaster
384postmaster: root
385
386root: <replaceable>&lt;LOGIN&gt;</replaceable>
387# End /etc/aliases</literal>
388EOF</userinput></screen>
389
390 <para>
391 To protect an existing <filename>/etc/aliases</filename> file,
392 the above command appends these aliases to it if it exists. This file
393 should be checked and duplicate aliases removed, if present.
394 </para>
395
396 <para>
397 The BLFS editors recommend to use LMDB instead of Berkeley DB for
398 Postfix tables. Add three lines into
399 <filename>/etc/postfix/main.cf</filename> to make
400 <command>postmap</command> encode the lookup tables in the LMDB
401 format by default and to change the default hash setting of the
402 alias tables:
403 </para>
404
405<screen role="root"><userinput>echo 'default_database_type = lmdb' &gt;&gt; /etc/postfix/main.cf &amp;&amp;
406echo 'alias_database = lmdb:/etc/aliases' &gt;&gt; /etc/postfix/main.cf &amp;&amp;
407echo 'alias_maps = lmdb:/etc/aliases' &gt;&gt; /etc/postfix/main.cf</userinput></screen>
408
409 <para>
410 To protect your server against the recent SMTP smuggling attacks,
411 additional steps are required. Add two lines into
412 <filename>/etc/postfix/main.cf</filename> to disconnect remote SMTP
413 clients that send bare newlines in the DATA section, while also
414 allowing clients on your network with non-standard SMTP implementations
415 to still send mail:
416 </para>
417
418<screen role="root"><userinput>echo 'smtpd_forbid_bare_newline = normalize' &gt;&gt; /etc/postfix/main.cf &amp;&amp;
419echo 'smtpd_forbid_bare_newline_exclusions = $mynetworks' &gt;&gt; /etc/postfix/main.cf</userinput></screen>
420
421 <para>
422 Note that if you are following an online tutorial to configure
423 Postfix, the tutorial may refer to a lookup table with
424 <literal>hash:/path/to/lookup_table</literal>. You should replace
425 <literal>hash</literal> with <literal>lmdb</literal> in order to use
426 a lookup table encoded in the LMDB format.
427 </para>
428
429 <note>
430 <para>
431 The <filename>/etc/postfix/main.cf</filename> and
432 <filename>/etc/postfix/master.cf</filename> files must be personalized
433 for your system. The <filename>main.cf</filename> file needs your
434 fully qualified hostname. You will find that
435 <filename>main.cf</filename> is self documenting, so load it into your
436 editor to make the changes you need for your situation.
437 </para>
438 </note>
439
440 <note>
441 <para>
442 <application>Postfix</application> can also be set up to
443 run in a chroot jail. See the file in the source
444 <filename>examples/chroot-setup/LINUX2</filename> for details.
445 </para>
446 </note>
447
448 <para>
449 To ensure that all permissions are set properly, <application>postfix</application>
450 provides a tool which is to be run as the
451 <systemitem class="username">root</systemitem> user:
452 </para>
453
454<screen role="nodump"><userinput>/usr/sbin/postfix -c /etc/postfix set-permissions</userinput></screen>
455
456 <para>
457 If you have an existing configuration, you can run the
458 <command>postfix</command> utility to add any necessary definitions to
459 your existing files. As the
460 <systemitem class="username">root</systemitem> user:
461 </para>
462
463<screen role="nodump"><userinput>/usr/sbin/postfix upgrade-configuration</userinput></screen>
464
465 <para>
466 Before starting <application>Postfix</application>, you should check
467 that your configuration and file permissions will work properly. Run the
468 following commands as the <systemitem class="username">root</systemitem>
469 user to check and start your <application>Postfix</application> server:
470 </para>
471
472<screen role="nodump"><userinput>/usr/sbin/postfix check &amp;&amp;
473/usr/sbin/postfix start</userinput></screen>
474
475 </sect3>
476
477 <sect3 id="postfix-init">
478 <title><phrase revision="sysv">Boot Script</phrase>
479 <phrase revision="systemd">Systemd Unit</phrase></title>
480
481 <para>
482 To automate the running of Postfix at startup, install the
483 <phrase revision="sysv"><filename>/etc/rc.d/init.d/postfix</filename>
484 init script</phrase>
485 <phrase revision="systemd"><filename>postfix.service</filename>
486 unit</phrase> included in the
487 <xref linkend="bootscripts" revision="sysv"/>
488 <xref linkend="systemd-units" revision="systemd"/> package:
489 </para>
490
491 <indexterm zone="postfix postfix-init">
492 <primary sortas="f-postfix">postfix</primary>
493 </indexterm>
494
495<screen role="root"><userinput>make install-postfix</userinput></screen>
496
497 </sect3>
498
499 </sect2>
500
501 <sect2 role="content">
502 <title>Contents</title>
503
504 <segmentedlist>
505 <segtitle>Installed Programs</segtitle>
506 <segtitle>Installed Libraries</segtitle>
507 <segtitle>Installed Directories</segtitle>
508
509 <seglistitem>
510 <seg>
511 mailq (symlink), newaliases (symlink), postalias, postcat, postconf,
512 postdrop, postfix, postkick, postlock, postlog, postmap, postmulti,
513 postqueue, postsuper, and sendmail
514 </seg>
515 <seg>
516 None
517 </seg>
518 <seg>
519 /{etc,usr/lib}/postfix,
520 /usr/share/doc/postfix-&postfix-version; and
521 /var/{lib,spool}/postfix
522 </seg>
523 </seglistitem>
524 </segmentedlist>
525
526 <variablelist>
527 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
528 <?dbfo list-presentation="list"?>
529 <?dbhtml list-presentation="table"?>
530
531 <varlistentry id="mailq">
532 <term><command>mailq</command></term>
533 <listitem>
534 <para>
535 A symlink to <filename>sendmail</filename>
536 </para>
537 <indexterm zone="postfix mailq">
538 <primary sortas="b-mailq">mailq</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="newaliases">
544 <term><command>newaliases</command></term>
545 <listitem>
546 <para>
547 A symlink to <filename>sendmail</filename>
548 </para>
549 <indexterm zone="postfix newaliases">
550 <primary sortas="b-newaliases">newaliases</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="postalias">
556 <term><command>postalias</command></term>
557 <listitem>
558 <para>
559 is a utility for <application>Postfix</application> alias database
560 maintenance
561 </para>
562 <indexterm zone="postfix postalias">
563 <primary sortas="b-postalias">postalias</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="postcat">
569 <term><command>postcat</command></term>
570 <listitem>
571 <para>
572 Prints the contents of files from the
573 <application>Postfix</application> queue in human readable format
574 </para>
575 <indexterm zone="postfix postcat">
576 <primary sortas="b-postcat">postcat</primary>
577 </indexterm>
578 </listitem>
579 </varlistentry>
580
581 <varlistentry id="postconf">
582 <term><command>postconf</command></term>
583 <listitem>
584 <para>
585 Displays or changes the value of
586 <application>Postfix</application> configuration parameters
587 </para>
588 <indexterm zone="postfix postconf">
589 <primary sortas="b-postconf">postconf</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="postdrop">
595 <term><command>postdrop</command></term>
596 <listitem>
597 <para>
598 Creates a file in the maildrop directory and copies its standard
599 input to the file
600 </para>
601 <indexterm zone="postfix postdrop">
602 <primary sortas="b-postdrop">postdrop</primary>
603 </indexterm>
604 </listitem>
605 </varlistentry>
606
607 <varlistentry id="postfix-bin">
608 <term><command>postfix</command></term>
609 <listitem>
610 <para>
611 is the <application>Postfix</application> control program
612 </para>
613 <indexterm zone="postfix postfix-bin">
614 <primary sortas="b-postfix">postfix</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="postkick">
620 <term><command>postkick</command></term>
621 <listitem>
622 <para>
623 Sends requests to the specified service over a local transport
624 channel
625 </para>
626 <indexterm zone="postfix postkick">
627 <primary sortas="b-postkick">postkick</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="postlock">
633 <term><command>postlock</command></term>
634 <listitem>
635 <para>
636 Locks a mail folder for exclusive use, and executes commands passed
637 to it
638 </para>
639 <indexterm zone="postfix postlock">
640 <primary sortas="b-postlock">postlock</primary>
641 </indexterm>
642 </listitem>
643 </varlistentry>
644
645 <varlistentry id="postlog">
646 <term><command>postlog</command></term>
647 <listitem>
648 <para>
649 A <application>Postfix</application>-compatible logging interface
650 for use in, for example, shell scripts
651 </para>
652 <indexterm zone="postfix postlog">
653 <primary sortas="b-postlog">postlog</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="postmap">
659 <term><command>postmap</command></term>
660 <listitem>
661 <para>
662 Creates or queries one or more Postfix lookup tables, or updates an
663 existing one
664 </para>
665 <indexterm zone="postfix postmap">
666 <primary sortas="b-postmap">postmap</primary>
667 </indexterm>
668 </listitem>
669 </varlistentry>
670
671 <varlistentry id="postmulti">
672 <term><command>postmulti</command></term>
673 <listitem>
674 <para>
675 is the <application>Postfix</application> multi-instance manager.
676 It allows a system administrator to manage multiple
677 <application>Postfix</application> instances on a single host
678 </para>
679 <indexterm zone="postfix postmulti">
680 <primary sortas="b-postmulti">postmulti</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="postqueue">
686 <term><command>postqueue</command></term>
687 <listitem>
688 <para>
689 The <application>Postfix</application> user interface for
690 queue management
691 </para>
692 <indexterm zone="postfix postqueue">
693 <primary sortas="b-postqueue">postqueue</primary>
694 </indexterm>
695 </listitem>
696 </varlistentry>
697
698 <varlistentry id="postsuper">
699 <term><command>postsuper</command></term>
700 <listitem>
701 <para>
702 The <application>Postfix</application> user interface for
703 superuser queue management
704 </para>
705 <indexterm zone="postfix postsuper">
706 <primary sortas="b-postsuper">postsuper</primary>
707 </indexterm>
708 </listitem>
709 </varlistentry>
710
711 <varlistentry id="sendmail-postfix">
712 <term><command>sendmail</command></term>
713 <listitem>
714 <para>
715 is the <application>Postfix</application> to
716 <application>Sendmail</application> compatibility interface
717 </para>
718 <indexterm zone="postfix sendmail-postfix">
719 <primary sortas="b-sendmail">sendmail</primary>
720 </indexterm>
721 </listitem>
722 </varlistentry>
723
724 </variablelist>
725
726 </sect2>
727
728</sect1>
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