Postfix expert needed for dialup config

[Tommy Trussell]

As I mentioned a few weeks ago, I set up my Mother-in-law's PC with
Ubuntu. (She wants to keep in touch with her church committees via
email.) She has a 28.8kbps modem. (Note: it's NOT any fun to update
Warty to the latest packages using a 28.8 modem!)

To avoid all sorts of difficult-to-explain error messages I set up the
mail handling something like a "traditional" dialup system connecting
to a "smarthost." I documented what I did here:

http://www.ubuntulinux.org/wiki/DialupEmailHowto

Unfortunately, it turns out the reason I haven't received any email
from her is NOT because she wasn't trying -- her outgoing mail (and
maybe her incoming mail) was just sitting in the queue, each with an
error saying "no route to host." (I tested everything when I set it
up, but all of her subsequent attempts failed.) When I drove the
machine over here and connected it to my Ethernet LAN, everything went
through just fine.

Most documentation I could find for postfix on a dialup connection is
at the Red Hat site, but the Red Hat configuration seems very
different from the configuration files the Ubuntu / Debian package
installs.

Before I take any more wrong turns, I'd like someone to look over my
details. I just uploaded information about my configuration and links
to the documentation pages I've been reading.

Feel free to reply on this list OR by adding comments to the Wiki page.