shadow/man/login.defs.d/MAIL_DIR.xml

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<varlistentry>
  <term><option>MAIL_DIR</option> (string)</term>
  <listitem>
    <para>
      The mail spool directory. This is needed to manipulate the mailbox
      when its corresponding user account is modified or deleted. If not
      specified, a compile-time default is used.
      The parameter CREATE_MAIL_SPOOL in <filename>/etc/default/useradd</filename>
      determines whether the mail spool should be created.
    </para>
  </listitem>
</varlistentry><varlistentry>
  <term><option>MAIL_FILE</option> (string)</term>
  <listitem>
    <para>
      Defines the location of the users mail spool files relatively to
      their home directory.
    </para>
  </listitem>
</varlistentry>
<!-- FIXME: MAIL_FILE not used in useradd -->
<para>
  The <option>MAIL_DIR</option> and <option>MAIL_FILE</option> variables
  are used by <command>useradd</command>, <command>usermod</command>, and
  <command>userdel</command> to create, move, or delete the user's mail
  spool.
</para>
<para condition="no_pam">
  If <option>MAIL_CHECK_ENAB</option> is set to
  <replaceable>yes</replaceable>, they are also used to define the
  <envar>MAIL</envar> environment variable.
</para>