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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] net-libs/courier-unicode-2.6.0:0/10::gentoo  691 KiB
[ebuild  N     ] net-mail/courier-common-3.3.0::gentoo  USE="gdbm -berkdb" 2387 KiB

Total: 2 packages (2 new), Size of downloads: 3078 KiB