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

Calculating dependencies ... done!
Dependency resolution took 1.10 s (backtrack: 0/20).

[ebuild  N     ] mail-filter/libmilter-1.0.2_p5:0/1.0.2_p5::gentoo  USE="-poll -verify-sig" 2317 KiB
[ebuild  N     ] dev-perl/Switch-2.170.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 15 KiB
[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] acct-group/opendmarc-1-r1::gentoo  0 KiB
[ebuild  N     ] acct-user/opendmarc-0-r2::gentoo  0 KiB
[ebuild  N     ] dev-db/mysql-connector-c-8.0.41-r1:0/21::gentoo  USE="-ldap -static-libs" 477295 KiB
[ebuild  N     ] dev-perl/DBD-mysql-5.13.0::gentoo  USE="mysql -mariadb -test" PERL_FEATURES="ithreads (-debug) -quadmath" 157 KiB
[ebuild  N     ] mail-filter/opendmarc-1.4.1.1-r5:0/3::gentoo  USE="reports -spf" 417 KiB

Total: 8 packages (8 new), Size of downloads: 480578 KiB