As far as I can tell net-mail/mailutils has not been using the name "mu" for any of its binaries for a while now. This is hard to track down, though there is a point on https://mailutils.org/wiki/Mailutils_(utility) that "Starting with version 2.99.99 it was reluctantly renamed to mailutils to avoid name clash with another tool bearing that name." Contrasting the NEWS file for 2.99.99 and 3.0, it seems that the rename went unmentioned, though both files introduce a new utility; one named "mu" in 2.99.99 and one named "mailutils" in 3.0. I think it is safe to assume that this is the same tool and that it has been renamed. The conflict with net-mail/mailutils can therefore be removed.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=92a6d0711e35c82aed3b00ce1eb4995ddd8c7ceb commit 92a6d0711e35c82aed3b00ce1eb4995ddd8c7ceb Author: Matt Smith <matt@offtopica.uk> AuthorDate: 2020-02-21 15:02:17 +0000 Commit: Joonas Niilola <juippis@gentoo.org> CommitDate: 2020-02-24 05:50:53 +0000 net-mail/mu: Stop blocking mailutils After version 2.99.99, the mailutils binary mu was renamed to mailutils and so they can now be installed simultaneously. Closes: https://bugs.gentoo.org/710388 Signed-off-by: Matt Smith <matt@offtopica.uk> Package-Manager: Portage-2.3.89, Repoman-2.3.20 Closes: https://github.com/gentoo/gentoo/pull/14731 Signed-off-by: Joonas Niilola <juippis@gentoo.org> net-mail/mu/mu-0.9.18-r2.ebuild | 5 +---- net-mail/mu/mu-1.0.ebuild | 5 +---- net-mail/mu/mu-1.3.5.ebuild | 5 +---- net-mail/mu/mu-1.3.6-r1.ebuild | 6 +----- net-mail/mu/mu-1.3.6.ebuild | 6 +----- 5 files changed, 5 insertions(+), 22 deletions(-)