OK ... then it ought to move (probably) :)
See my post on repoforge users list. http://lists.repoforge.org/pipermail/users/2012-January/022634.html .... There's no one to move the package but Dag.
Per your suggestion, I filed a bug report on this, although that tracker seems like a lonely place. :)
FYI for the CentOS list, this issue has been resolved (perl-NetAddr-IP has been moved to the RepoForge extras repository).
Yum no longer complains that perl-NetAddr-IP has to be updated and spamassassin does not produce errors.
Thanks again