File: //usr/share/webmin/postfix/help/opt_mailbox_transport.html
<header>Optional actual transport to use</header>
<center><tt>mailbox_transport</tt></center>
<hr>
This parameter specifies the optional transport (in <tt>master.cf</tt>)
to use after processing aliases and <tt>.forward</tt> files.
<p>
This parameter has precedence over the
<a href=opt_mailbox_command><tt>mailbox_command</tt></a>,
<a href=opt_fallback_transport><tt>fallback_transport</tt></a> and
<a href=opt_luser_relay><tt>luser_relay</tt></a> parameters.
<hr>