[Exim] using !!Outlook!! with exim

Hi,

I run a remote Linux mail server using exim. I use Mutt on that server, however my girlfriend and her mother use Outlook from their own houses (ie, not directly connected to the mail server network). They both have email address that are local to the mail server. However, as they don't have static ip address (56k modem and cable modem), the mail server refuses to forward mail that is sent from their local hosts (I only want to relay for authorised domains, but putting, for instance, host_accept_relay = foo.com (with foo.com being a local domain) doesn't work).

All I want is to say "forward all mail which has a local domain, even if it is not being sent from the local host (ie the mail server). So if my domain is foo.com, I want to allow *foo.com to be forwarded no matter where the sender sends from. And it needs to be domain specific, as no static ip addresses are available.

I'm sure this can be done, but I haven't been able to find anything on it.

Any help appreciated and thanks in advance.

Cheers,

Keith