app-backup/sarab ebuild has a dep on mail-client/mailx However I do not use mailx, I use mail-client/nail (which blocks mailx). From Sarab's scope mailx and nail do the exact same thing. Suggest changing mail-client/mailx line in ebuild to virtual/mailx That way mailx is whats installed if there is no mailer but portage will not complain if nail or similiar is already installed.
Thanks for the bug report. I updated the ebuild to use virtual/mailx