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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] net-libs/courier-unicode-2.3.2:0/7::gentoo  643 KiB
[ebuild  N     ] net-mail/courier-common-3.1.5-r2::gentoo  USE="gdbm -berkdb" 2106 KiB

Total: 2 packages (2 new), Size of downloads: 2749 KiB