[Exim] remote_smtp "delivery notification" ?

Hi,

I am using exim on a dialup machine,
so the exim queue is run whenever the machine
goes online and every n minutes while online.

I'd like to have a feedback to via Mail
as soon as the queue is emptied,
that is after/during the remote_smtp transport.

Ideally I'd like to use shadow_transport
to send a header_only version of the Mail
back to the sender as success confirmation.

Is there any way to do this
or else some workaround ?


Yours,
Steffen