Version 1.12.7 is available upstream. Please consider updating! It seems that version 1.12.7 is available upstream, while the latest version in the Gentoo tree is 1.12.6-r1. You think this warning is false? Read more about it here.
'mu' is a set of command-line tools for Linux/Unix that enable you to quickly find the e-mails you
are looking for, assuming that you store your e-mails in Maildirs. It also includes an emacs based mail client mu4e.