[exim] exim 4.70+ in ubuntu hardy

Hi

I know this is not a list for ubuntu related questions, but this is the list
with the most exim administrators and probably not that few are using
debian/ubuntu.

Regarding the current vulnerability I am searching for an backport of exim
4.70 (or better) for ubuntu 8.04.
(http://lists.exim.org/lurker/thread/20101210.083335.f3d05cab.en.html)

Can anyone recommend such a backport?

Regards,
Steffen