Have you ever used MindTerm? It's free for non-commercial use, and can do
ssh tunneling. I've used it before, and set it up for other users. You can
check it out here:

http://www.mindbright.se/mindterm/

It's java, so it runs on most commmercial platforms (and if they're using
linux/bsd, ssh-tunneling should be easy anyway).

Setting up a tunnel from port 1025 of the local machine to port 25 of your
server should solve the problems. Their SMTP server would become
localhost:1025, and they could just leave the tunnel up all the time.

-- Erik

On Fri, 5 Sep 2003, MLH wrote:

> Date: 5 Sep 2003 20:29:40 GMT
> From: MLH <MLH@goathill.org>
> To: netbsd-help@NetBSD.ORG
> Newsgroups: netbsd.help
> Subject: vpn question
>
> I have a naive vpn question...
>
> One of our local (family) network 'accounts' moved to another city
> and is running behind a cable modem and a linksys BEFSX41 vpn/router.
> The cable account only offers pop email and this account would like
> to continue to use the imap ssl email account here. All fine and
> dandy for retrieving email, but the cable account refuses to relay
> email from behind the cable modem.
>
> What would be the easiest and reasonably secure way to let that
> box relay through my (postfix) server?
>
> Thanks
>
>