RE: Re: How can this work?

I've gotten it working. The 587 (Submission) was the trick. Unfortunately,
IMail (IPSwitch.com) doesn't listen on 587. Luckily, it's behind a firewall
that does<g>. Problem solved with:
iptables -A PREROUTING -p tcp -m tcp --dport submission -d 63.171.93.5 -j
DNAT --to-destination 172.27.0.5:25 and a port override in my email client.

Dan

<snip>

> Always use your "home" SMTP server to send e-mail, using SMTP AUTH
> and submitting using port 587/submission.
</snip>