Routing solution on mail servers with all domain pointing at the same externel IP

Hi folks,


I'm searching around for a solution to solve my problem as mentioned
hereinbelow;


I have a Xen box (a virtualizaion box) with following setup:-


MTA - Postfix 2.3.8
Database - MySQL 5.0.32 (running on Guest01)
Courier IMAP 4.1.1
etc.


Host - Debian Etch Workstation
Guest01 - mail server for routing and running postfix virtual
Guest02 - mail server, hostname01. localIP_01, domain01
Guest03 - mail server, hostname02, localIP_02, domain02
Guest04 - mail server, hostname03, localIP_03, domain03
etc.

all mail servers running postfix on Debian Etch.

single (one) external IP with all ports forwarded to Guest01 except 
port 53 which is forwarded to the DNS server, also running on a guest
of the Xen box.


Guest01 routes all incoming mails, which are pointing at same external
IP, according to their domains to respective mail servers.  All
outgoing mails are sent via the routing mail server, Guest01, to
Internet.


The system is working nicely on Intranet.  Mail client, Evolution, on
workstations connected to local network, the Intranet, can send/receive
mails on mail servers.  Server settings on mail client work on either
local IP or on hostname.  


My problem is if the workstation is on remote site, not on local
network, with one external IP how can the remote mail client find the 
mail server which it needs to connect.  


Can perdition help me out?  If YES Please shed me some light how to
start?


Shall I follow;
perdition: Mail Retrieval Proxy,  
http://www.vergenet.net/linux/perdition/perdition_paper/html/
???


Any other relevant document for installation and config of perdition
for reference to solve my problem?


TIA


B.R.
Stephen L


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