From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Newsgroups: gmane.emacs.help Subject: Re: Google Gmail mailing list bounces Date: Fri, 24 May 2019 09:09:02 +0200 Message-ID: <20190524070902.GA11740@tuxteam.de> References: <20190221170259478078146@bob.proulx.com> <20190523172148538275561@bob.proulx.com> <86ef4oivmo.fsf@zoho.eu> <20190523175139068895086@bob.proulx.com> <86d0k8h0re.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="qMm9M+Fa2AknHoGS" Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="249483"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Mutt/1.5.21 (2010-09-15) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri May 24 09:10:25 2019 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hU4LR-0012gh-AX for geh-help-gnu-emacs@m.gmane.org; Fri, 24 May 2019 09:10:25 +0200 Original-Received: from localhost ([127.0.0.1]:50175 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hU4LQ-0002vM-1t for geh-help-gnu-emacs@m.gmane.org; Fri, 24 May 2019 03:10:24 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:48264) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hU4KK-0002GV-UO for help-gnu-emacs@gnu.org; Fri, 24 May 2019 03:09:20 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hU4KI-00020y-KM for help-gnu-emacs@gnu.org; Fri, 24 May 2019 03:09:16 -0400 Original-Received: from mail.tuxteam.de ([5.199.139.25]:47614) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hU4KI-0001vD-4U for help-gnu-emacs@gnu.org; Fri, 24 May 2019 03:09:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tuxteam.de; s=mail; h=From:In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:To:Date; bh=9S6Oy2qrmXXC5JsfvpycVfImeX7bp81cjtUJeCk2O+4=; b=BVVCnH0MtNqgGdMbHPpUtNNTv7ATV5qQskJP1aVkIMxtzx8JhG/xK/xmdSEDNjhytqszmfHSrB7p7/VBLEVnc7cBF6Um9H/1h1fFj1pHx5s/Uaz8lw/ITLIyW3mHR+BGdIOQH7jmvhrmD4L9LC7+3o8Qv7hgtBSLw6J6FG14vjjehE/a41TuESRK2rkHyPsWYyMTMTbrrkPyJyoCg2BorBbtv/YfdMrHbiKytJne+0xLpWubW6kEobk1UivFDeCA9PKeeMZtJRNwY0aEdFnhqL9/dp+Q5w3BxBjFGJsQfk7gnGnGPkwow5yw+MPPfhfBuURzIusGVoL6B28HZ+pWwQ==; Original-Received: from tomas by mail.tuxteam.de with local (Exim 4.80) (envelope-from ) id 1hU4K6-0003HA-5F for help-gnu-emacs@gnu.org; Fri, 24 May 2019 09:09:02 +0200 Content-Disposition: inline In-Reply-To: <86d0k8h0re.fsf@zoho.eu> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 5.199.139.25 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:120608 Archived-At: --qMm9M+Fa2AknHoGS Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, May 24, 2019 at 07:36:37AM +0200, Emanuel Berg via help-gnu-emacs w= rote: > Bob Proulx wrote: >=20 > > $ dig _dmarc.zoho.eu txt +short > > "v=3DDMARC1; p=3Dreject; sp=3Dreject; fo=3D0; > > rua=3Dmailto:dmarc.reports.eu@zoho.eu; > > ruf=3Dmailto:dmarc.reports.eu@zoho.eu" >=20 > Afer figuring out this command, which wasn't > easy [1], I get two different replies from > executing it. This is by far the most common > one: [...] > ;; Received 122 B > ;; Time 2019-05-24 07:27:26 CEST > ;; From 192.168.10.1@53(UDP) in 1.0 ms >=20 >=20 > But once, one time, after several invocations I got this: [...] > ;; AUTHORITY SECTION: > eu. 600 IN SOA nl.dns.eu. tech.eurid.eu. 1053404310 = 3600 1800 3600000 600 >=20 > ;; Received 176 B > ;; Time 2019-05-24 07:25:22 CEST > ;; From 192.168.10.1@53(UDP) in 28.0 ms >=20 >=20 > Questions: >=20 > Why does one get two different replies? Because the second one has no "DNS authority section" [1]. As a background: this DMARC (and DKIM and SPF) stuff uses DNS as a distributed database. Your computer is set up to ask your local domain name server (192.168.10.1). This one asks another server, and so on, until that recursion hits the serv= er which "knows" where dmarc.zoho.eu is. But your local server isn't totally stupid and keeps (caches) that answer, because it knows you and expects you to ask again: then it can answer right away. But because he (she?)'s a truthful server, it will tell you: "so-and-so told me" -- that's the authority section (I don't quite remember whether dig shows you the authority section for cached answers or for fresh ones). Or something like that :-) > What does 122 B and 176 B mean? That would mean bytes, I think. The size of the answer. > What does the authority section mean? See above. > Where can you see their mailing list policy? That should be the very first line of the DNS reply: > v=3DDMARC1; p=3Dreject; sp=3Dreject; fo=3D0; rua=3Dmailto:dmarc.reports.e= u@zoho.eu; ruf=3Dmailto:dmarc.reports.eu@zoho.eu (I can't say in detail what each of those things means, but there's quite a bit of docs on that around) That all said... I'd urge everyone to chose a mail provider who cares about mail. The big ones, the "free" offers and your ISP all want to kill mail because there's no money in it. Since they can't kill it directly, they starve it. Spam (and the corresponding anti-spam measures) are their allies in that. There are small mail providers who take a very affordable amount (here in DE typically 1EUR/month) and actually know what they are doing (e.g. posteo.de, mailbox.org). Consider supporting those. Cheers [1] https://en.wikipedia.org/wiki/Domain_Name_System#Authoritative_name_ser= ver -- tom=C3=A1s --qMm9M+Fa2AknHoGS Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlznmI4ACgkQBcgs9XrR2kajQQCfb8DSylWnrS1ZnCRuxaNtVZAV 1DAAninO0WHyVqRcn6uVXJ0E8U+FMgO/ =MPSf -----END PGP SIGNATURE----- --qMm9M+Fa2AknHoGS--