debian-user: exim to ISP setup

[Brendan J Simon <brendan.simon@bigpond.com>]

I have a few users on a LAN connected to an ISP via a permanent dial up 
connection.  Some messages with large attachments never get through to a 
user is the USA (I'm in Australia).  I'm thinking that there may be some 
outs coming into play due to the slow dial up connection.  I assume the 
exim mail agent is talking directly to the SMTP server in the USA.  What 
I would prefer to do is send the email to my ISPs SMTP server and have 
it forward it on to the USA user.  This should help dramatically if it 
is a time out problem and seems a smarter thing to do in general.

I've read the exim docs and configuration file but can't see how to 
configure this.  Can this be done and how do I do it ???

Thanks for any help or pointers,
Brendan Simon.