Running the /var/www/localhost/htdocs/bugzilla/checksetup.pl script outputs the following information in its output when checking for _required_ modules: Checking for Email-MIME (v1.861) found v1.860 Thus, the ebuild should require the more recent version of Email-MIME.
Created attachment 192358 [details] /root/bugzilla-3.0.5-checksetup.pl.out the script's output
I guess this is fixed. At least >3.0.8 depends on >=dev-perl/Email-MIME-1.86.