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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Marco Moock <mm+usenet-es@dorfdsl.de> Newsgroups: comp.mail.sendmail Subject: strange host lookups Date: Thu, 3 Oct 2024 11:02:09 +0200 Organization: A noiseless patient Spider Lines: 132 Message-ID: <vdlmii$3kha3$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Injection-Date: Thu, 03 Oct 2024 11:02:10 +0200 (CEST) Injection-Info: dont-email.me; posting-host="4effd6c79098d5f20ee3f3930b1c2d9f"; logging-data="3818819"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX195KSoHyM6ihUqBNij7JJiF" Cancel-Lock: sha1:Awnk2Iosx0P9FP7COYSJbM9F7L0= Bytes: 7089 Hello! I am currently experimenting with a test system. I am running 8.18.1-6 amd64 on Debian sid. I've used https://www.email-security-scans.org to let me send an email directly to the test system. This mail has been received and now needs to be sent to another machine via an alias. This works for other mails I generated. It only fails for that specific mail. It fails with [...] >>> MAIL From:<reply@email-security-scans.org> SIZE=6644 250 2.1.0 <reply@email-security-scans.org>... Sender ok >>> RCPT To:<mm@dorfdsl.de> >>> DATA 250 2.1.5 <mm@dorfdsl.de>... Recipient ok 354 Enter mail, end with "." on a line by itself v4-mail.dnssec-...urity-scans.org: Name server timeout timeout writing message to pi-keller.dorfdsl.de. mm@dorfdsl.de... Deferred: Name server: pi-keller.dorfdsl.de.: host name lookup failure Closing connection to pi-keller.dorfdsl.de. root@test:~# root@test:~# grep v4 /var/spool/mqueue/qf4938SHcZ025471 Mhost map: lookup (v4-mail.dnssec-broken.measurement.email-security-scans.org): deferred "measurement@v4-mail.measurement.email-security-scans.org" <measurement@v4-mail.measurement.email-security-scans.org>, "measurement@v4-mail.v6only.measurement.email-security-scans.org" <measurement@v4-mail.v6only.measurement.email-security-scans.org>, "measurement@v4-mail.dnssec-broken.measurement.email-security-scans.org" <measurement@v4-mail.dnssec-broken.measurement.email-security-scans.org> root@test:~# v4-mail.dnssec-broken.measurement.email-security-scans.org This lookup should intentionally fail when the resolver is verifying DNSSEC. OT: The concept of this service is that you reply to the test mail and they analyze the received mail. E.g. is an answer to the domain with broken DNSSEC arrives, they know that DNSSEC won't be checked. The question is just why sendmail resolves that name, as it isn't an SMTP recipient of the current mail nor a sender or hostname etc. It is only part of the Reply-To header of the mail (to test if the used DNS server checks DNSSEC). Why are domain parts of Reply-To looked up? Or is there another thing I missed that cause this lookup? This is the entire qf: V8 T1727944097 K1727945909 N18 P1570325 I8/1/655570 MDeferred Fbs $_mail.email-security-scans.org [IPv6:2a06:d1c0:dead:3:0:0:0:88] $rESMTP $smail.email-security-scans.org ${daemon_flags} ${if_addr}IPv6:2a01:170:118f:2:0:0:0:24 S<reply@email-security-scans.org> Ctest:8:0:<test@test.dorfdsl.de> rRFC822; test@test.dorfdsl.de RPFDA:mm@dorfdsl.de H?P?Return-Path: <<81>g> H??Authentication-Results: test.dorfdsl.de; dmarc=pass (p=reject dis=none) header.from=email-security-scans.org H??Authentication-Results: test; spf=pass (sender SPF authorized) smtp.mailfrom=email-security-scans.org (client-ip=2a06:d1c0:dead:3::88; helo=mail.email-security-scans.org; envelope-from=reply@email-security-scans.org; receiver=<UNKNOWN>) H??Authentication-Results: test.dorfdsl.de; dkim=pass (1024-bit key; secure) header.d=email-security-scans.org header.i=@email-security-scans.org header.a=rsa-sha256 header.s=key01 header.b=NnieD4po; dkim-atps=neutral H??Received: from mail.email-security-scans.org (mail.email-security-scans.org [IPv6:2a06:d1c0:dead:3:0:0:0:88]) by test.dorfdsl.de (8.18.1/8.18.1/Debian-6) with ESMTP id 4938SHcZ025471 for <test@test.dorfdsl.de>; Thu, 3 Oct 2024 10:28:17 +0200 H??DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=email-security-scans.org; s=key01; t=1727944092; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:list-help: list-owner:list-unsubscribe; bh=DJeYYMbaf+xiARgr9NWbvpGneJ0J1bj3uGoeqX8XziY=; b=NnieD4poOfqaoFSdtBs9di0al9+cElESiaL9W3znrGbKyxuE6ms2HzooeasZIwBP7U/jIP oSpogBRGh7512ebuJZkAa/me7FH+0Gg9BMTVGnnddsP/0G6rTMpJ6398Q7arffObDoONST 1yyij1xjKMK069wcfAGZPzD5nWuU8Hs= H??Received: by mail.email-security-scans.org (OpenSMTPD) with ESMTPSA id f6cc5500 (TLSv1.3:TLS_CHACHA20_POLY1305_SHA256:256:NO) auth=yes user=relay for <test@test.dorfdsl.de>; Thu, 3 Oct 2024 08:28:12 +0000 (UTC) H??Date: Thu, 3 Oct 2024 08:28:11 +0000 H??To: "test@test.dorfdsl.de" <test@test.dorfdsl.de> H??From: Email Delivery Evaluation <reply@email-security-scans.org> H??Reply-To: "measurement@mail-plaintext.measurement.email-security-scans.org" <measurement@mail-plaintext.measurement.email-security-scans.org>, "measurement@v4-mail.measurement.email-security-scans.org" <measurement@v4-mail.measurement.email-security-scans.org>, "measurement@v6-mail.measurement.email-security-scans.org" <measurement@v6-mail.measurement.email-security-scans.org>, "measurement@v4-mail.v6only.measurement.email-security-scans.org" <measurement@v4-mail.v6only.measurement.email-security-scans.org>, "measurement@v6-mail.v6only.measurement.email-security-scans.org" <measurement@v6-mail.v6only.measurement.email-security-scans.org>, "measurement@v4-mail.dnssec-broken.measurement.email-security-scans.org" <measurement@v4-mail.dnssec-broken.measurement.email-security-scans.org> H??Subject: Test ID:8has3gphg0vzxgrdcehqzzfwhnggs7: Your email deliverability test from email-security-scans.org H??Message-ID: <iJN1dAfHIr9hajw0oznbXsp5R7SKUl7PtLRmZP8mcwY@www.email-security-scans.org> H??X-Mailer: EmailConfTester (https://email-security-scans.org/) H??Auto-Submitted: auto-generated H??List-Help: <https://email-security-scans.org/description/> H??List-Unsubscribe: <https://email-security-scans.org/optout/nwjroydmx9lp2s6cchhimh4njstd2g/test%40test.dorfdsl.de>, <mailto:unsubscribe@email-security-scans.org?subject=test%40test.dorfdsl.de%20unsubscribe%20email-security-scans.org> H??List-Owner: <mailto:abuse@email-security-scans.org> (Contact service operator abuse team for further inquiries.) H??MIME-Version: 1.0 H??Content-Type: multipart/alternative; boundary="b1_iJN1dAfHIr9hajw0oznbXsp5R7SKUl7PtLRmZP8mcwY" H??Content-Transfer-Encoding: 8bit .. -- kind regards Marco