!!! resolution failed
!!! request ( ( ('repo.livefs',) EqualityMatch: =False || ( ('category',) == virtual && ('package_is_real',) EqualityMatch: =False ) ) && =mail-filter/zdkimfilter-3.21 ), mode none
!!! trying mail-filter/zdkimfilter-3.21
!!!   request mail-mta/courier, mode depend
!!!   trying mail-mta/courier-2.0.8
!!!     request ( not (!mail-mta/nullmailer) && mail-mta/nullmailer ), mode none
!!!     failed due to depend blocker: !mail-mta/nullmailer conflicts w/ [<MutatedPkg pkg=<pkgcore.vdb.ondisk._WrappedInstalledPkg object at 0x109b4d010> overrides=('bdepend', 'depend', 'rdepend', 'pdepend', 'idepend') @0x109b50500>]
!!!     removing choices involving !mail-mta/nullmailer
!!!   removing choices involving mail-mta/courier

Failures encountered:
!!! failed '( ( ('repo.livefs',) EqualityMatch: =False || ( ('category',) == virtual && ('package_is_real',) EqualityMatch: =False ) ) && =mail-filter/zdkimfilter-3.21 )'
potentials:
repo gentoo: [ ebuild src: mail-filter/zdkimfilter-3.21 ]