I wrote an ebuild for the Perl Mail::Sendmail module. It would be nice if it could be added to the portage tree because it is a dependancy for PureSecure an TIDS from Demarc, for that I will provide an ebuild, too. (As soon as I have found somebody who could help me writing it, patches and testing for PureSecure on Gentoo are finished, so I can provide them to anyone interested in helping me to create the ebuild)
*** Bug 7739 has been marked as a duplicate of this bug. ***
Created attachment 11511 [details] the ebuild noticed that I forgot to upload the ebuild, instead I've had only put a link to it on my homepage...
A system is being worked on to allow Portage to automatically install Perl modules from CPAN. If possible, I would like to wait to have this feature handle this ebuild. However, if something outside of the dev-perl tree, like these other programs you mention, should get into Portage, I will reconsider, as it will be needed as a dependency.
g-cpan.pl appears to install this module correctly straight from CPAN.