[BSA-016] Security Update for exim4

Andreas Metzler uploaded new packages for exim4 which fixed the
following security problems:

CVE-2010-4345 exim privilege escalation
Exim 4.72 and earlier allows local users to gain privileges by
leveraging the ability of the exim user account to specify an
alternate configuration file with a directive that contains
arbitrary commands, as demonstrated by the spool_directory
directive.

For the lenny-backports distribution the problem has been fixed in
version 4.72-3~bpo50+1.

For the stable distribution (lenny), this problem will be fixed in
version 4.69-9+lenny2.

For the upcoming stable version (squeeze) and the unstable distribution
(sid), this problems has been fixed in version 4.72-3.

For the experimental distribution, these problems have been fixed in
version 4.73~rc1-1.

Upgrade instructions

If you don't use pinning (see [1]) you have to update the package
manually via "apt-get -t lenny-backports install <packagelist>" with
the packagelist of your installed packages affected by this update.
[1] <http://backports.debian.org/Instructions&gt;

We recommend to pin (in /etc/apt/preferences) the backports repository to
200 so that new versions of installed backports will be installed
automatically.

Package: *
Pin: release a=lenny-backports
Pin-Priority: 200