Mail::SpamCannibal's Makefile.PL attempts to extend the behaviour of ExtUtils::MakeMaker by messing with its internals, but some of those internals have changed.
For example, the warnings are normal, but it attempts to silence them. However, the way in which it does that doesn't work since ExtUtils-MakeMaker-6.44 (Feb 28, 2008).
I don't know if the other problems are related to this hackery. Your best bet would be to install an old version of ExtUtils::MakeMaker:
tar xvzf ExtUtils-MakeMaker-$OLDVER.tar.gz
perl Makefile.PL PREFIX=/tmp/oldMM LIB=/tmp/oldMM/lib/perl5
make test install
...proceed to install Mail-SpamCannibal...