No client will help, because the mailing list erases the original Reply-To header, so it's impossible for the MUA to determine it.
Some people, e.g. I, even don't set up a Reply-To. That's the from the list's headers of your mail: "Date: Fri, 6 Feb 2015 08:14:59 -0300 From: Hugo Osvaldo Barrera <hugo@barrera.io> To: "Discussion about the Arch User Repository (AUR)" <aur-general@archlinux.org> Subject: Re: [aur-general] Email Notifications of new AUR orphaning/deletion/merging method Reply-To: "Discussion about the Arch User Repository \(AUR\)" <aur-general@archlinux.org> Sender: "aur-general" <aur-general-bounces@archlinux.org>" If I push Claws' "Sender" button, the mail only would be send to Hugo Osvaldo Barrera <hugo@barrera.io>. If I use Claws' "Reply" button, the mail only is send to AUR general. If I push Evolution's group reply button, the mail is only send to the list. If I push Evolution's reply button, Evolution asks me, if I want to reply to you or to Arch general. In addition, both MUAs allow to reply to all. So I at least have got two MUAs installed that are able to handle this "issue". Regards, Ralf