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