source: server/mail/courier.xml@ 0931098

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
   "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

<!ENTITY courier-download-http "http://prdownloads.sourceforge.net/courier/courier-&courier-version;.tar.bz2">
<!ENTITY courier-download-ftp " ">
<!ENTITY courier-size "4.2 MB">
<!ENTITY courier-buildsize "114 MB">
<!ENTITY courier-time "3.00 SBU">

]>

<sect1 id="courier" xreflabel="Courier-&courier-version;">
<?dbhtml filename="courier.html"?>
<title>Courier-&courier-version;</title>

<sect2>
<title>Introduction to <application>Courier</application></title>

<para>The <application>Courier</application> package contains a Mail Transport 
Agent (<acronym>MTA</acronym>). This is useful for sending email to other users 
of your host machine. It can also be configured to be a central mail server for
your domain or a mail relay agent. The <application>Courier</application> 
packages also includes a web-based email interface, <acronym>IMAP</acronym>,
<acronym>IMAP</acronym>-<acronym>SSL</acronym>, <acronym>POP</acronym>3, and
<acronym>POP</acronym>3-<acronym>SSL</acronym>.</para>

<!--
The configuration
listed below will allow users with <acronym>PAM</acronym> and virtual-users in 
a <application>My<acronym>SQL</acronym></application> Database access to email.</para>
-->

<sect3><title>Package information</title>
<itemizedlist spacing='compact'>
<listitem><para>Download (HTTP): <ulink url="&courier-download-http;"/></para></listitem>
<listitem><para>Download (FTP): <ulink url="&courier-download-ftp;"/></para></listitem>
<listitem><para>Download size: &courier-size;</para></listitem>
<listitem><para>Estimated Disk space required: &courier-buildsize;</para></listitem>
<listitem><para>Estimated build time: &courier-time;</para></listitem></itemizedlist>
</sect3>

<sect3><title><application>Courier</application> dependencies</title>
<sect4><title>Required</title>
<para><xref linkend="gdbm"/><!-- or <xref linkend="db"/> --></para></sect4>
<sect4><title>Optional</title>
<para>
<xref linkend="mysql"/> or <xref linkend="postgresql"/>, 
<xref linkend="Linux_PAM"/>,
<xref linkend="openssl"/>, 
<xref linkend="fam"/>,
<xref linkend="openldap"/>,
<xref linkend="apache"/>,
<xref linkend="ispell"/> or <xref linkend="aspell"/>,
<xref linkend="gnupg"/>,
<ulink url="http://expect.nist.gov/">Expect</ulink>,
<ulink url="http://netpbm.sourceforge.net/">Netpbm</ulink> and
<ulink url="http://alpha.greenie.net/mgetty/">Mgetty+Sendfax</ulink>
</para></sect4>
</sect3>

</sect2>

<sect2>
<title>Installation of <application>Courier</application></title>

<para> Before you compile the program, you need to create users and groups that 
will be expected to be in place when the install script executes. Add the users 
and groups with the following commands:</para>

<screen><userinput><command>groupadd courier &amp;&amp;
useradd -c 'Courier Mail Server' -d /dev/null -g courier -s /bin/false courier</command></userinput></screen>

<para> You also need to create a bin user. If you already have a user
named bin, this step can be safely ignored.</para>

<screen><userinput><command>useradd -c 'bin' -d /dev/null -g bin -u 1 bin</command></userinput></screen>

<para>This creates a
<filename class="directory">/var/run/courier</filename> directory where
all the <application>Courier</application> <acronym>MTA</acronym> pid
files will exist. This will allow <filename>courierfilter.pid</filename>
to be created. Without the <command>courierfilter</command> running, the
<application>Courier</application> MTA will not work. Issue the
following commands to create
<filename class="directory">/var/run/courier</filename>:</para>

<screen><userinput><command>mkdir /var/run/courier &amp;&amp;
chown courier:courier /var/run/courier</command></userinput></screen>

<para>Install <application>courier</application> by running the following commands:</para>

<screen><userinput><command>./configure --prefix=/usr --libexecdir=/usr/lib/courier \
    --datadir=/usr/share/courier --sysconfdir=/etc/courier \
    --localstatedir=/var/lib/courier --with-piddir=/var/run/courier \
    --disable-root-check --with-mailuser=courier --with-mailgroup=courier \
    --with-paranoid-smtpext --disable-autorenamesent \
    --enable-workarounds-for-imap-client-bugs --with-db=gdbm &amp;&amp;
make &amp;&amp;
make install &amp;&amp;
make install-configure</command></userinput></screen>

</sect2>

<sect2>
<title>Command explanations</title>

<para><parameter>--libexecdir=/usr/lib/courier</parameter>: Specifies
the directory which contains programs and libraries that cannot be
directly executed from the command-line.</para>

<para><parameter>--datadir=/usr/share/courier</parameter>: Specifies the 
directory where miscellaneous shell scripts,
<application>Perl</application> scripts, and data files will be
installed.</para>

<para><parameter>--localstatedir=/var/spool/courier</parameter>:
Specifies the directory that will hold the mail queue, and other
temporary data.</para>

<para><parameter>--with-piddir=/var/run/courier</parameter>: Specifies
the directory where <application>Courier</application>'s
<filename>PID</filename> files are stored when
<application>Courier</application> is active.</para>

<para><option>--disable-root-check</option>: Allows
<application>Courier</application> to be built as the root user.</para>

<para><parameter>--with-mailuser=courier</parameter>: All except two
<application>Courier</application> daemons run as a non-privileged user.
This option specifies the userid that <application>Courier</application>
will install and run as.</para>

<para><parameter>--with-mailgroup=courier</parameter>: like
<option>--with-mailuser</option>, but specifies the group
<acronym>ID</acronym>.</para>

<para><option>--with-paranoid-smtpext</option>: Be paranoid when
negotiating Courier-specific <acronym>ESMTP</acronym> extensions with
remote servers. The <application>Courier</application> mail server
defines and implements certain experimental <acronym>ESMTP</acronym>
extensions: XVERP and XEXDATA. Problems may result in the event that
someone else uses the same name to implement some other extension. If
this option is specified, <application>Courier's</application>
<acronym>ESMTP</acronym> server will also advertise a dummy
<acronym>ESMTP</acronym> capability called XCOURIEREXTENSIONS, and will
not recognize any Courier-specific extensions unless the remote mail
server also advertises this dummy <acronym>ESMTP</acronym>
capability.</para>

<para><option>--disable-autorenamesent</option>: Do not rename the Sent
folder every month. This option can also be controlled by the
<envar>SQWEBMAIL_AUTORENAMESENT</envar> environment variable.</para>

<para><option>--enable-workarounds-for-imap-client-bugs</option>: There
are several confirmed bugs in some <acronym>IMAP</acronym> clients that
do not properly implement the <acronym>IMAP</acronym>4rev1 protocol.
This option enables some workarounds for those buggy
<acronym>IMAP</acronym> clients. NOTE: <command>make check</command>
will fail if this option is used. You should first configure without
this option, and if all post-configuration tests succeed, rerun
configure with this option and recompile.</para>

<para><parameter>--with-db=gdbm</parameter>:
<application>Courier</application> requires either the
<application><acronym>GDBM</acronym></application> or the
<application>DB</application> database library.
<application><acronym>GDBM</acronym></application> is used if both are
present. This option forces the selection of the GDBM database
library since support for DB is broken at the current state.</para>

<!-- # Note - Courier will build fine with <xref linkend="db"/>, but all
the database files will not be created correctly -->

<para><parameter>--with-ispell=/usr/bin/aspell</parameter>:
<application>Courier</application>'s webmail server can use spell
checking, if <command>configure</command> finds
<application>ispell</application> or if you explicitly set the location
of <application>aspell</application>.</para>

<para><parameter>--enable-mimetypes=<replaceable>[location of mime.types file]</replaceable></parameter>: 
Use this switch if you receive an error saying that the
<filename>mime.types</filename> file could not be found.</para>
    
</sect2>

<sect2>
<title>Configuring <application>Courier</application></title>

<sect3><title>Config files</title>
<para><filename>/etc/courier/*</filename></para>
</sect3>

<sect3><title>Configuration Information</title>

<para>Make the following changes in
<filename>/etc/courier/authmysqlrc</filename> file if you are utilizing
<application>My<acronym>SQL</acronym></application>:</para>

<screen><userinput>MYSQL_SERVER            localhost
MYSQL_USERNAME          courier
MYSQL_PASSWORD          <replaceable>[your choice]</replaceable> 
MYSQL_SOCKET            /tmp/mysql.sock
MYSQL_PORT              3306
MYSQL_DATABASE          courier_mail
MYSQL_USER_TABLE        users
MYSQL_CLEAR_PWFIELD     clear
DEFAULT DOMAIN          <replaceable>[your domain]</replaceable>
MYSQL_QUOTA_FIELD       quota</userinput></screen>

<para>If you utilize <application>PAM</application>:</para>

<screen><userinput><command>cat &gt; /etc/pam.d/esmtp &lt;&lt; "EOF"</command>
# Begin /etc/pam.d/esmtp

auth            required                pam_unix.so try_first_pass
account         required                pam_unix.so
session         required                pam_unix.so

# End /etc/pam.d/esmtp
<command>EOF
cat &gt; /etc/pam.d/pop3 &lt;&lt; "EOF"</command>
# Begin /etc/pam.d/pop3

auth            required                pam_unix.so try_first_pass
account         required                pam_unix.so
session         required                pam_unix.so

# End /etc/pam.d/pop3
<command>EOF
cat &gt; /etc/pam.d/imap &lt;&lt; "EOF"</command>
# Begin /etc/pam.d/imap

auth            required                pam_unix.so try_first_pass
account         required                pam_unix.so
session         required                pam_unix.so

# End /etc/pam.d/imap
<command>EOF
cat &gt; /etc/pam.d/webmail &lt;&lt; "EOF"</command>
# Begin /etc/pam.d/webmail

auth            required                pam_unix.so try_first_pass
account         required                pam_unix.so
session         required                pam_unix.so

# End /etc/pam.d/webmail
<command>EOF</command></userinput></screen>

<para>Connect to the <application>My<acronym>SQL</acronym></application>
database:</para>

<screen><userinput><command>mysql -p</command></userinput></screen>

<para>This command will create the database for authentication:</para>

<screen><userinput><command>CREATE DATABASE courier_mail;
USE courier_mail</command></userinput></screen>

<para>This command will setup the table users for the courier_mail
database:</para>

<screen><userinput><command>CREATE TABLE users (
id                    char(128) DEFAULT '' NOT NULL,
crypt                 char(128) DEFAULT '' NOT NULL,
clear                 char(128) DEFAULT '' NOT NULL,
name                  char(128) DEFAULT '' NOT NULL,
uid                   int(10) unsigned DEFAULT '65534' NOT NULL,
gid                   int(10) unsigned DEFAULT '65534' NOT NULL,
home                  char(255) DEFAULT '' NOT NULL,
quota                 char(255) DEFAULT '' NOT NULL,
KEY id (id(128))
);</command></userinput></screen>

<para>This will add the courier user that we specified earlier in the
<filename>/etc/courier/authmysqlrc</filename> file:</para>

<screen><userinput><command>GRANT ALL PRIVILEGES ON *.* TO courier@localhost IDENTIFIED BY '<replaceable>[password]</replaceable>' WITH GRANT OPTION;
QUIT</command></userinput></screen>

<para><emphasis>General Settings for Mail</emphasis></para>

<para>You will need to create the following files with the contents
specified.</para>

<para><filename>/etc/courier/defaultdomain</filename></para>

<screen><userinput><command>cat &gt; /etc/courier/defaultdomain &lt;&lt; "EOF"</command>
<replaceable>[yourdomain]</replaceable>
<command>EOF</command></userinput></screen>

<para><filename>/etc/courier/me</filename></para>

<screen><userinput><command>cat &gt; /etc/courier/me &lt;&lt; "EOF"</command>
<replaceable>[servername.yourdomain]</replaceable>
<command>EOF</command></userinput></screen>

<para><filename>/etc/courier/locals</filename></para>

<screen><userinput><command>cat &gt; /etc/courier/locals &lt;&lt; "EOF"</command>
localhost
<replaceable>[yourdomain]</replaceable>
<command>EOF</command></userinput></screen>

<para><filename>/etc/courier/esmtpacceptmailfor.dir/system</filename></para>

<screen><userinput><command>cat &gt;/etc/courier/esmtpacceptmailfor.dir/system &lt;&lt; "EOF"</command>
localhost
<replaceable>[yourdomain]</replaceable>
<command>EOF</command></userinput></screen>

<para>You will also need to edit the aliases file and change the
following entry.</para>

<para><filename>/etc/courier/aliases/system</filename></para>

<screen><userinput>postmaster: <replaceable>[your administrator email]</replaceable></userinput></screen>

<para>If you want to deny access from some hosts from sending mail, you
will need to edit the
<filename>/etc/courier/smtpaccess/default</filename> file.</para>

<para>After the above steps are completed you will need to run the
following commands:</para>

<screen><userinput><command>makesmtpaccess &amp;&amp;
makehosteddomains &amp;&amp;
makealiases</command></userinput></screen>

<para><emphasis><acronym>SMTP</acronym>/<acronym>SMTMP</acronym>-<acronym>SSL
</acronym> Configuration</emphasis></para>

<para>This section will enable the <acronym>SMTP</acronym> Server from Courier</para>

<para><filename>/etc/courier/esmtpd</filename></para>

<screen><userinput>ESMTPDSTART=YES</userinput></screen>

<para><filename>/etc/courier/esmtpd-ssl</filename></para>

<screen><userinput>ESMTPDSSLSTART=YES</userinput></screen>

<para><emphasis><acronym>POP</acronym>3/<acronym>POP</acronym>3-<acronym>SSL
</acronym> Configuration</emphasis></para>

<para>This section will enable the <acronym>POP</acronym>3 Server from
Courier</para>


<para><filename>/etc/courier/pop3d</filename></para>

<screen><userinput>POP3DSTART=YES</userinput></screen>

<para><filename>/etc/courier/pop3d-ssl</filename></para>

<screen><userinput>POP3DSLLSTART=YES</userinput></screen>

<para><emphasis><acronym>IMAP</acronym>/<acronym>IMAP</acronym>-<acronym>SSL
</acronym> Configuration</emphasis></para>

<para>This section will enable the <acronym>IMAP</acronym> Server from
Courier</para>

<para><filename>/etc/courier/imapd</filename></para>


<screen><userinput>IMAPDSTART=YES</userinput></screen>

<para><filename>/etc/courierd/imapd-ssl</filename></para>

<screen><userinput>IMAPDSSLSTART=YES</userinput></screen>

<para><emphasis>Creating Mail directories for System Users</emphasis></para>


<para>This section will explain how to create MailDirs for
your system users.</para>

<screen><userinput><command>cd /home/<replaceable>[username]</replaceable> &amp;&amp;
maildirmake Maildir &amp;&amp;
chown <replaceable>[username]</replaceable>.<replaceable>[username]</replaceable> Maildir -R</command></userinput></screen>

<para><emphasis>Setup for Virtual users</emphasis></para>

<para>This section will explain how to setup Maildir for your virtual
users.</para>

<screen><userinput><command>groupadd -g 9000 vmailman &amp;&amp;
useradd -c 'Virtual Mailman' -g vmailman -m -k /dev/null -u 9000 vmailman</command></userinput></screen>

<para>Now to setup the Maildir for these virtual users.</para>

<screen><userinput><command>cd /home/vmailman &amp;&amp;
mkdir <replaceable>[virtual_user]</replaceable> &amp;&amp;
cd <replaceable>[virtual_user]</replaceable> &amp;&amp;
maildirmake Maildir &amp;&amp;
chown vmailman.vmailman Maildir -R</command></userinput></screen>

<para>Connect to the <application>My<acronym>SQL</acronym></application>
database.</para>

<screen><userinput><command>mysql -u courier -p</command></userinput></screen>
    
<para>To add the virtual user you need to enter at
least one version of the password either clear text or encrypted.</para>

<screen><userinput><command>USE courier_mail
INSERT INTO users VALUES (
'<replaceable>[virtual_users]</replaceable>@<replaceable>[domain.com]</replaceable>,
'<replaceable>[encrypted password or blank]</replaceable>',
'<replaceable>[clear text password or blank]</replaceable>',
'<replaceable>[User's Name]</replaceable>',
9000,
9000,
'<replaceable>[location of Maildir]</replaceable>',
'<replaceable>[Quota in Bytes']</replaceable>
);
QUIT</command></userinput></screen>

<para>For example:</para>

<screen><userinput><command>INSERT INTO users VALUES (
'blfsuser@linuxfromscratch.org',
'',
'password',
'BLFS User',
9000,
9000,
'/home/vmailman/blfsuser',
''
);</command></userinput></screen>

<para><emphasis>Setup for Web-based Email</emphasis></para>

<para>This section will explain how to setup Courier Web-based email
system.</para>

<para>You will need to copy the <filename>webmail</filename> file from
<filename>/usr/lib/courier/courier/webmail</filename> to your <filename>cgi-bin
</filename> directory of your <application>Apache</application>
server.</para>

<screen><userinput><command>cp -a /usr/lib/courier/courier/webmail/webmail /var/www/cgi-bin</command></userinput></screen>

<para>You will then need to copy the images to a directory under your
<filename>htdocs</filename> directory of your
<application>Apache</application> server. The directory needs to be named 
<filename>webmail</filename> or you need to specify it during the configure
phase with <parameter>--enable-imageurl=<replaceable>[URL]</replaceable></parameter>.</para>

<screen><userinput><command>cp -a /usr/share/courier/sqwebmail/images /var/www/htdocs/webmail</command></userinput></screen>
<para><emphasis>Setup for Web-based Email</emphasis></para>

<para>This section will explain how to setup Courier Web-based administration
system.</para>

<para>You will need to copy the <filename>webadmin</filename> file from
<filename class="directory">/usr/lib/courier/courier/webmail</filename>
to your <filename class="directory">cgi-bin</filename> directory of your 
<application>Apache</application> server.</para>

<screen><userinput><command>cp -a /usr/lib/courier/courier/webmail/webadmin /var/www/cgi-bin</command></userinput></screen>

<para><filename>/etc/courier/webadmin/password</filename></para>

<screen><userinput><command>cat &gt; /etc/courier/webadmin/password &lt;&lt; "EOF"</command>
<replaceable>[password]</replaceable>
<command>EOF</command></userinput></screen>

<para>If you are not using <acronym>SSL</acronym> on your <application>Apache
</application> server, you will need to add
<filename>/etc/courier/webadmin/unsecureok</filename>, so you will be able
to use your web based administration tool.</para>

<screen><userinput><command>touch /etc/courier/webadmin/unsecureok</command></userinput></screen>
</sect3>

<sect3><title>Courier init.d script</title>

<para>The startup script from the <application>Courier</application> package is 
the easiest to use. It will automatically create missing data files, and 
<acronym>SSL</acronym> certificates if they are missing. To install the 
init.d file for <application>Courier</application>, you will need to use the 
following commands:</para>

<screen><userinput><command>cp /usr/src/courier-&courier-version;/courier.sysvinit /etc/rc.d/init.d/courier &amp;&amp;
chmod 754 /etc/rc.d/init.d/courier</command></userinput></screen>

<para>Create the symbolic links to this file in the relevant
<filename>rc.d</filename> directory with the following commands:</para>

<screen><userinput><command>cd /etc/rc.d/init.d &amp;&amp;
ln -sf ../init.d/courier ../rc0.d/K25courier &amp;&amp;
ln -sf ../init.d/courier ../rc1.d/K25courier &amp;&amp;
ln -sf ../init.d/courier ../rc2.d/K25courier &amp;&amp;
ln -sf ../init.d/courier ../rc3.d/S35courier &amp;&amp;
ln -sf ../init.d/courier ../rc4.d/S35courier &amp;&amp;
ln -sf ../init.d/courier ../rc5.d/S35courier &amp;&amp;
ln -sf ../init.d/courier ../rc6.d/K25courier</command></userinput></screen>

</sect3>
</sect2>

<sect2>
<title>Contents</title>

<para>The <application>Courier</application> package contains
<command>addcr</command>,
<command>authenumerate</command>,
<command>cancelmsg</command>,
<command>courier</command>,
<command>courier-config</command>,
<command>courieresmtpd</command>,
<command>courierfilter</command>,
<command>courierldapaliasd</command>,
<command>courierlogger</command>,
<command>couriermlm</command>,
<command>couriertcpd</command>,
<command>couriertls</command>,
<command>deliverquota</command>,
<command>dotforward</command>,
<command>esmtpd</command>,
<command>esmtpd-msa</command>,
<command>esmtpd-ssl</command>,
<command>filterctl</command>,
<command>imapd</command>,
<command>imapd</command>,
<command>imapd-ssl</command>,
<command>lockmail</command>,
<command>mailbot</command>,
<command>maildiracl</command>,
<command>maildirkw</command>,
<command>maildirmake</command>,
<command>maildrop</command>,
<command>makeacceptmailfor</command>,
<command>makealiases</command>,
<command>makedat</command>,
<command>makehosteddomains</command>,
<command>makemime</command>,
<command>makepercentrelay</command>,
<command>makesmtpaccess</command>,
<command>makesmtpaccess-msa</command>,
<command>makeuserdb</command>,
<command>makeuucpneighbors</command>,
<command>mimegpg</command>,
<command>mkesmtpdcert</command>,
<command>mkimapdcert</command>,
<command>mkpop3dcert</command>,
<command>pop3d</command>,
<command>pop3d-ssl</command>,
<command>preline</command>,
<command>pw2userdb</command>,
<command>reformail</command>,
<command>reformime</command>,
<command>rmail</command>,
<command>sendmail</command>,
<command>sharedindexinstall</command>,
<command>sharedindexsplit</command>,
<command>showconfig</command>,
<command>showmodules</command>,
<command>testmxlookup</command>,
<command>userdb</command>,
<command>userdbpw</command>,
<command>vchkpw2userdb</command> and
<command>webgpg</command>.</para>

</sect2>

<sect2><title>Description</title>

<sect3><title>cancelmsg</title>
<para><command>cancelmsg</command> removes a message from the mail queue.</para></sect3>

<sect3><title>courier</title>
<para><command>courier</command> is a modular multi-protocol E-mail
transport agent. The <command>courier</command> command is an
administrative command, and most of its options are only available to
the superuser.</para></sect3>

<sect3><title>courierfilter</title>
<para><command>courierfilter</command> command installs or uninstalls
global mail filters. Global mail filters are used to selectively block
unwanted mail.</para></sect3>

<sect3><title>couriermlm</title>
<para><command>couriermlm</command> is the Courier mailing list manager.</para></sect3>

<sect3><title>filterctl</title>
<para><command>filterctl</command> command installs or uninstalls global
mail filters. Global mail filters are used to selectively block unwanted
mail.</para></sect3>

<sect3><title>lockmail</title>
<para><command>lockmail</command> is a helper utility for working with mailbox files.</para></sect3>

<sect3><title>mailbot</title>
<para><command>mailbot</command> reads an E-mail message on standard input and creates an E-mail message
replying to the original message's sender.</para></sect3>

<sect3><title>maildirkw</title>
<para><command>maildirkw</command> modifies Courier-IMAP compatible maildir message keywords.</para></sect3>

<sect3><title>maildrop</title>
<para><command>maildrop</command> is a replacement local mail delivery agent that includes a mail filtering
language.</para></sect3>

<sect3><title>makeacceptmailfor</title>
<para><command>makeacceptmailfor</command> Build a list of domains to accept mail for from the
<filename>/etc/courier/esmtpacceptmailfor.dir</filename> directory.</para></sect3>

<sect3><title>makealiases</title>
<para><command>makealiases</command> Build a list of aliases from the <filename>/etc/courier/aliases</filename>
or <filename>/etc/courier/aliasdir</filename> directories.</para></sect3>

<sect3><title>makehosteddomains</title>
<para><command>makehostedomains</command> Build a database of hosted domains from <filename>hosteddomains</filename>.</para></sect3>

<sect3><title>makepercentrelay</title>
<para><command>makepercentrelay</command> Build a list of %-relayed
domains from the <filename>percentrelay.dir</filename>
directory.</para></sect3>

<sect3><title>makesmtpaccess</title>
<para><command>makesmtpaccess</command> Build ESMTP server access file
from the <filename>/etc/courier/smtpaccess</filename>
directory.</para></sect3>

<sect3><title>makesmtpaccess-msa</title>
<para><command>makesmtpaccess-msa</command> Build ESMTP server access
file from the <filename>/etc/courier/smtpaccess</filename>
directory. This esmtp list is for the MSA protocol.</para></sect3>

<sect3><title>makeuucpneighbors</title>
<para><command>makeuucpneighbors</command> Builds a list of
<acronym>UUCP</acronym> recipients using <filename>/etc/courier/uucpneighbors</filename>.</para></sect3>

<sect3><title>reformail</title>
<para><command>reformail</command> program reads a message on standard input, reformats it in some way,
 and writes the message to standard output.</para></sect3>

<sect3><title>reformime</title>
<para><command>reformime</command> is a utility for reformatting MIME messages.</para></sect3>

<sect3><title>sendmail</title>
<para><command>sendmail</command> command reads an E-mail message and delivers the message to its recipients.
This sendmail command is part of the Courier mail server, although it attempts to emulate the behavior of the
original sendmail MTA.</para></sect3>

<sect3><title>showconfig</title>
<para><command>showconfig</command> Shows the current Courier configuration.</para></sect3>

<sect3><title>showmodules</title>
<para><command>showmodules</command> Shows the current Courier modules.</para></sect3>

<sect3><title>testmxlookup</title>
<para><command>testmxlookup</command> lists the names and IP addresses of mail relays that receive mail for the
domain.  This is useful in diagnosing mail delivery problems.</para></sect3>

</sect2>
</sect1>