[exim] smtp through a ssh tunnel to exim4

This is my configuration for sending mail from home.
SSH is not needed on my LAN. This works with no problem.

Oberon MUA at home ==LAN==> exim4 at home ==WAN==> ISP

This is the trial configuration for sending mail from a
remote location, most commonly from work.

Remote Oberon MUA ==ssh tunnel==> exim4 at home ==WAN==> ISP

It fails. exim4 appears to not acknowledge the ssh connection.

Someone please tell me how to coerce exim4 into relaying
a message submitted through a ssh tunnel.

Where is the exim4 configuration stored? I have
/etc/exim4/exim4.conf.template but no
/etc/exim4/exim4.conf .

Thanks,          ... Peter E.

Desktops.OpenDoc http://carnot.pathology.ubc.ca/