These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.05 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/MIME-tools-5.517.0::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 416 KiB
[ebuild  N     ] net-mail/ytnef-2.1.2::gentoo  USE="-static-libs" 295 KiB

Total: 2 packages (2 new), Size of downloads: 710 KiB