must be a dotted-decimal IP address.

       <STRONG>maildir2smtp</STRONG> retrieves a message's envelope sender address
       and envelope recipient address from  the  <STRONG>Return-Path</STRONG>  and
       <STRONG>Delivered-To</STRONG>  lines  at the top of the message header.  It
       removes these lines before passing the message along.

       <STRONG>maildir2smtp</STRONG> removes <EM>prefix</EM> from  the  beginning  of  each
       envelope  recipient address.  It ignores any message whose
       recipient address does not begin with <EM>prefix</EM>.

       <STRONG>maildir2smtp</STRONG> is designed to pass messages along a SLIP  or
       PPP  link.  To set this up on the disconnected end, create
       a new maildir in <STRONG>~alias</STRONG>:

          # maildirmake ~alias/pppdir
          # chown -R alias ~alias/pppdir

       Put

          :alias-ppp

       into <STRONG>control/virtualdomains</STRONG> and

          ./pppdir/

       into <STRONG>~alias/.qmail-ppp-default</STRONG>.  Don't  forget  the  extra
       slash in <STRONG>pppdir/</STRONG>.  Then, in the PPP startup script, do

          maildir2smtp ~alias/pppdir alias-ppp- $IP `hostname`

       replacing  $IP with the remote IP address.  A similar pro-
       cedure works on the connected end: put

          virt.host:joe-ppp

       into    <STRONG>control/virtualdomains</STRONG>    and    <STRONG>./pppdir/</STRONG>    into
       <STRONG>~joe/.qmail-ppp-default</STRONG>; then <STRONG>joe</STRONG> can run

          maildir2smtp $HOME/pppdir joe-ppp- $IP `hostname`

       when he establishes a connection.

       <STRONG>maildir2smtp</STRONG>  is  reliable:  it  will not remove a message