mailman настроен так, что ломает подпись. На примере письма vseleznv@altlinux.org в devel@ Authentication-Results: as.office.etersoft.ru (amavisd-new); dkim=softfail (invalid, public key: not available) header.i=@altlinux.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=altlinux.org; s=dkim; h=Subject:Content-Transfer-Encoding:Content-Type: MIME-Version:Message-ID:To:From:Date:Sender:Reply-To:Cc:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=zXHHhds4P7slt6UEynBXxcAKNVx4i1QTxN7QRdGOkrc=; b=p5UjoekPrszDZTvpPKJeJsGhOs WtMNPrnGtv0NNkETgJEUqxojuczmDA1gZQXsfb+wHpr5SueLzeHo5dB4dO8VG3YLwabXpSadfiGju 9aMTou0qzvYZLg7MISCTvqzj9uCMsLWf5zt2/ugvhtZs3G7qaoegQ+YeqPCo41v8WwfDjlcq0/zKP VLQGl9QKCnshq01wBVz/o9UB7P1mapBsmVFKw+69qZghx/lyQK6t7A8DZqqrMUfHesvHCWdUv3H9e tPFl8WxyDaE5xJ3jlwUBM8XSKGMzXADRlOtTudJxYD8TzJny3D/rFbPmX7UVdb7E1eqaU6/HM8OdY 59JXar3g==; https://wiki.list.org/DEV/DKIM