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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] acct-group/postfix-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/postsrsd-0::gentoo  0 KiB
[ebuild  N     ] dev-libs/confuse-3.4:0/2.1.0::gentoo  USE="nls -static-libs" 643 KiB
[ebuild  N     ] mail-filter/postsrsd-2.0.11-r6::gentoo  USE="sqlite -redis -test" 64 KiB

Total: 4 packages (4 new), Size of downloads: 707 KiB