Regarding email.

Can anyone tell me why I can't resend this mail to my wife on my server from my work?
My wife: [email protected]
Me at work: [email protected]
my email server freja.bnjpro.dk (which is the receiving part for my wife).
ISPC 3.3.9
Ubuntu 22.04
Freshly installed between Christmas and newyear.

I receive this message from the exchange server at work.

Code:

Leveringen til følgende modtagere eller grupper mislykkedes:
[email protected]
Der opstod et problem under levering af meddelelsen. Prøv at sende meddelelsen igen senere.





Diagnosticeringsoplysninger for administratorer:
Genererende server: DB9PR04MB9235.eurprd04.prod.outlook.com
[email protected]
Remote Server returned '554 5.4.0 < #5.4.312 smtp;550 5.4.312 Message expired, DNS query failed>'
Oprindelige brevhoveder:
Received: from PAXPR04MB8111.eurprd04.prod.outlook.com (2603:10a6:102:1c7::9)
 by DB9PR04MB9235.eurprd04.prod.outlook.com (2603:10a6:10:371::12) with
 Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5944.19; Wed, 11 Jan
 2023 22:06:06 +0000
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
 b=mmPlF9DRe5Vta0koEXU2EHDV00YT8HLbSgLvmMUPmeNJnj5wjqmb0HsIdzAITqEHe/TX9Ex85i7sQeZKRgzh1+E8CQ5Nwn1M2GZAhR+DRM4jpTq2trmT2iPropiQnwSVpWXMPB9mwYKJfwlgav87OIFcswlgSCXwJ/KjZhEVpoYAHeoqUF526Tsw4Xt1VOgah0mOG3W0maZ9lKVJYYC4xVnr6CQU62Lw6aJ5uaAND7PiXdwvgbr6sJQNaf6tqL51euV2AD1mX/YHBWQ4K/7bOB9By/pSpZTPhcHQPfj4fSvUzd2Ha4RnsAkrlwVEIrTInkmnvZMmq9eePOhUM4LN5Q==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;
 s=arcselector9901;
 h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1;
 bh=RcEDLbQF+o4gR0cPuBnt6g5blyoGBmordn3pXByDY3o=;
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ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is
 192.38.125.140) smtp.rcpttodomain=klingxxxx.dk smtp.mailfrom=yyy.ku.dk;
 dmarc=pass (p=none sp=none pct=100) action=none header.from=yyy.ku.dk;
 dkim=none (message not signed); arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yyy.ku.dk;
 s=selector1;
 h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
 bh=RcEDLbQF+o4gR0cPuBnt6g5blyoGBmordn3pXByDY3o=;
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Received: from AM6PR08CA0037.eurprd08.prod.outlook.com (2603:10a6:20b:c0::25)
 by PAXPR04MB8111.eurprd04.prod.outlook.com (2603:10a6:102:1c7::9) with
 Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5986.18; Wed, 11 Jan
 2023 09:57:29 +0000
Received: from AM0EUR02FT044.eop-EUR02.prod.protection.outlook.com
 (2603:10a6:20b:c0:cafe::7b) by AM6PR08CA0037.outlook.office365.com
 (2603:10a6:20b:c0::25) with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.13 via Frontend
 Transport; Wed, 11 Jan 2023 09:57:29 +0000
X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 192.38.125.140)
 smtp.mailfrom=yyy.ku.dk; dkim=none (message not signed)
 header.d=none;dmarc=pass action=none header.from=yyy.ku.dk;
Received-SPF: Pass (protection.outlook.com: domain of yyy.ku.dk designates
 192.38.125.140 as permitted sender) receiver=protection.outlook.com;
 client-ip=192.38.125.140; helo=mailedg02pw.ku.dk; pr=C
Received: from mailedg02pw.ku.dk (192.38.125.140) by
 AM0EUR02FT044.mail.protection.outlook.com (10.13.54.111) with Microsoft SMTP
 Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
 15.20.6002.13 via Frontend Transport; Wed, 11 Jan 2023 09:57:29 +0000
Received: from mailsepo01.ku.dk (10.78.10.24) by MAILEDG02PW.unicph.domain
 (192.38.125.140) with Microsoft SMTP Server id 15.1.2507.6; Wed, 11 Jan 2023
 10:56:41 +0100
Received: from 10.78.10.21 ([10.78.10.21])
          by mailsepo01.ku.dk (JAMES SMTP Server 2.3.2-1) with SMTP ID 202
          for <[email protected]>;
          Wed, 11 Jan 2023 10:56:40 +0100 (CET)
Received: from MAILMBX08PW.unicph.domain (10.77.128.236) by
 MAILMBX12PW.unicph.domain (10.77.128.238) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id
 15.1.2507.16; Wed, 11 Jan 2023 10:56:40 +0100
Received: from MAILMBX08PW.unicph.domain ([fe80::40d7:9b70:2449:a283]) by
 MAILMBX08PW.unicph.domain ([fe80::40d7:9b70:2449:a283%4]) with mapi id
 15.01.2507.017; Wed, 11 Jan 2023 10:56:40 +0100
From: Bent Neumann Jensen <[email protected]>
To: "[email protected]" <[email protected]>
Subject: VS: YouSee inviterer til koncert i Royal Arena
Thread-Topic: YouSee inviterer til koncert i Royal Arena
Thread-Index: AdkkFbmEEsL1jyziTzCifepgguMICQBjT7gA
Date: Wed, 11 Jan 2023 09:56:40 +0000
Message-ID: <[email protected]>
References: <[email protected]od.outlook.com>
In-Reply-To: <[email protected]od.outlook.com>
Accept-Language: da-DK, en-US
Content-Language: da-DK
X-MS-Has-Attach: yes
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x-originating-ip: [10.78.10.8]
x-endpointsecurity-0xde81-ev: v:7.8.1.244, d:out, a:y, w:t, t:55,
 sv:1673417717, ts:1673431000
Content-Type: multipart/related;
    boundary="_006_6858c7d4a13a4317ab024efe9ea22706nbikudk_";
    type="multipart/alternative"
MIME-Version: 1.0
Return-Path: [email protected]
X-EOPAttributedMessage: 0
X-MS-PublicTrafficType: Email
X-MS-TrafficTypeDiagnostic: AM0EUR02FT044:EE_|PAXPR04MB8111:EE_|DB9PR04MB9235:EE_
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there's something wrong with dns somewhere:

Remote Server returned '554 5.4.0 < #5.4.312 smtp;550 5.4.312 Message expired, DNS query failed>'

 

Thanks. It was a misconfiguration of my DNS.

 

When visitting https://www.dnsqueries.com/en/smtp_test_check.php to test mailserver I get this answer:

Code:

The SMTP server does not accept mails to [email protected][IP_ADDRESS]. This is a very bad thing, as this address is used by people that don't know your domain name! The reported error is:

Is that even possible to set a mailaddress where the ip-address is the domain part in ispc?

 

Well if you want to be strictly RFCs conform you have to support this yes. Also [email protected][IP] IIRC. But note that i my days i've never tested this or even thought about it because no one uses this address anymore i guess, all that i get in that mailbox is spam.

But this should be enabled by default in postfix i thought?

 

Thank you both. I'll just leave it as it is.
I am looking at all things about the server now, and I am very happy to have you guys on the side, to help me understand and learn about what is nice to have and what is need to have.