P.S : This time I use my v6 smtp server even though at home I cannot still use a v6 prefix ;)
interesting to see the whole trail. Received: from psg.com ([2001:418:1::62]) by ran.psg.com with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.86_2) (envelope-from <address-policy-wg-bounces@ripe.net>) id 1dvx51-000885-77 for randy@ran.psg.com; Sun, 24 Sep 2017 02:55:39 +0000 Received: from [2001:67c:2e8:11::c100:1372] (helo=mahimahi.ripe.net) by psg.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89 (FreeBSD)) (envelope-from <address-policy-wg-bounces@ripe.net>) id 1dvx50-000K7L-8w for randy@psg.com; Sun, 24 Sep 2017 02:55:38 +0000 Received: from titi.ripe.net ([193.0.23.11]) by mahimahi.ripe.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from <address-policy-wg-bounces@ripe.net>) id 1dvx4r-000Am2-6a; Sun, 24 Sep 2017 04:55:31 +0200 Received: from chouchou.ripe.net ([193.0.19.37]) by titi.ripe.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from <address-policy-wg-bounces@ripe.net>) id 1dvx4q-0008Iz-TD; Sun, 24 Sep 2017 04:55:28 +0200 Received: from localhost.localdomain ([127.0.0.1] helo=chouchou.ripe.net) by chouchou.ripe.net with esmtp (Exim 4.84_2) (envelope-from <address-policy-wg-bounces@ripe.net>) id 1dvx4q-0002yO-O6; Sun, 24 Sep 2017 04:55:28 +0200 Received: from mahimahi.ripe.net ([2001:67c:2e8:11::c100:1372]) by chouchou.ripe.net with esmtp (Exim 4.84_2) (envelope-from <randy@psg.com>) id 1dvx4p-0002yI-Oa for address-policy-wg@lists.ripe.net; Sun, 24 Sep 2017 04:55:27 +0200 Received: from ran.psg.com ([2001:418:8006::18]) by mahimahi.ripe.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89) (envelope-from <randy@psg.com>) id 1dvx4o-000Alk-Lk for address-policy-wg@ripe.net; Sun, 24 Sep 2017 04:55:27 +0200 Received: from localhost ([127.0.0.1] helo=ryuu.rg.net) by ran.psg.com with esmtp (Exim 4.86_2) (envelope-from <randy@psg.com>) id 1dvx4l-00087z-Nh; Sun, 24 Sep 2017 02:55:24 +0000 as i said, thanks to NTT i have no ipv6 at home. but it goes v6 as soon as it hits my outbound smtp server, arrives at the ncc over ipv6, bounces around within the ncc over ipv4, and then exits the ncc over ipv6 randy