File: //usr/share/webmin/postfix/help/opt_virtual_maps.html
<header>Domain mapping lookup tables</header>
<center><tt>virtual_maps</tt></center>
<hr>
This parameter specifies optional lookup tables to redirect specific addresses
or even complete domains to another address. This is typically used to
implement virtual domain support.
<p>
By default, no address redirection is done.
<p>
Examples:
<ul>
<li><tt>dbm:/etc/postfix/virtual</tt>
<li><tt>hash:/etc/postfix/virtual</tt>
<li><tt>hash:/etc/postfix/virtual, nis:virtual</tt>
<li><tt>hash:/etc/postfix/virtual, netinfo:/virtual</tt>
</ul>
<hr>