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

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

[ebuild  N     ] mail-filter/libsrs2-1.0.18-r1::gentoo  USE="-static-libs" 289 KiB
[ebuild  N     ] mail-filter/couriersrs-0.1.2-r1::gentoo  510 KiB

Total: 2 packages (2 new), Size of downloads: 799 KiB