<header>Destination address for unknown recipients</header>
<center><tt>luser_relay</tt></center>
<hr>
This parameter specifies an optional destination address for unknown
recipients. By default, mail for unknown local recipients is bounced.
<p>
The following expansions are done:
<ul>
<li><tt>$user</tt> (recipient username),
<li><tt>$shell</tt> (recipient shell),
<li><tt>$home</tt> (recipient home directory),
<li><tt>$recipient</tt> (full recipient address),
<li><tt>$extension</tt> (recipient address extension),
<li><tt>$domain</tt> (recipient domain),
<li><tt>$local</tt> (entire recipient localpart),
<li><tt>$recipient_delimiter</tt>.
</ul>
Specify <tt>${name?value}</tt> or <tt>${name:value}</tt> to expand value only
when <tt>$name</tt> does (does not) exist.
<p>
Examples:
<ul>
<li><tt>$user@other.host</tt>
<li><tt>$local@other.host</tt>
<li><tt>admin+$local</tt>
</ul>
<hr>
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