routing network

[Linda]

At this point I have a working configuration that let me dial into my 
business and create a ppp connected network. I have forwarding turned on 
for the machine that answers the phone. I dail in with kppd it starts 
pppd on the server as part of the login script then kppd starts pppd on 
the client and sets the network. Then I manually add the imap servers 
email address to the routing table on my machine and I can read delete 
email etc. When I send mail though it uses my local broadband connection 
to send.  I'd like to set it up so if I call in from someplace where i 
don't have an internet connection I can use the mail servers networks 
internet connection to send mail. I can ping the router gateway and even 
ssh in over the pppd connection.

I can add the gateway machine to the route table

route add gateway-ipaddress ppp0

but when if I then try to make it the gateway

route add gw gateway-ipaddress

I get host unreachable.  Any ideas on how to get this to work?
     
             Thanks
              Linda