Emails from one domain are marked as spam the rest is OK

Dear all,

As title says. I have multiple domains on MIAB, but only with one I am facing issues that emails are marked with SPAM.

When testing blacklist with mxtoolbox my IP gets triggered with UCEPROTECTL3 but as mentioned only one domain is affected.

In custom DNS no special setting have changed. I only have
+++++++
Web has been disabled for this domain because you have set a custom DNS record.
A redirect from ‘www.xxxxxx.xxx’ has been disabled for this domain because you have set a custom DNS record on the www subdomain
++++++++

Can you propose some test that I can perform between domains to see where is the problem.

Thank in advance Z

Usually the reason for it being marked as spam is in the header of the email.

Can u share the header?

Have you checked with the blacklist to see why they have you listed?

Hi I am pasting the header text

Received: from VE1EUR01FT024.eop-EUR01.prod.protection.outlook.com
 (2a01:111:e400:7e19::48) by
 VE1EUR01HT081.eop-EUR01.prod.protection.outlook.com (2a01:111:e400:7e19::342)
 with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3933.31; Mon, 15 Mar
 2021 09:29:11 +0000
Received: from EUR04-HE1-obe.outbound.protection.outlook.com (104.47.13.51) by
 VE1EUR01FT024.mail.protection.outlook.com (10.152.2.213) with Microsoft SMTP
 Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
 15.20.3933.31 via Frontend Transport; Mon, 15 Mar 2021 09:29:11 +0000
Received: from AM6P195CA0010.EURP195.PROD.OUTLOOK.COM (2603:10a6:209:81::23)
 by AM5PR03MB3074.eurprd03.prod.outlook.com (2603:10a6:206:19::23) with
 Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3933.32; Mon, 15 Mar
 2021 09:29:09 +0000
Received: from VE1EUR01FT061.eop-EUR01.prod.protection.outlook.com
 (2603:10a6:209:81:cafe::14) by AM6P195CA0010.outlook.office365.com
 (2603:10a6:209:81::23) with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3933.31 via Frontend
 Transport; Mon, 15 Mar 2021 09:29:09 +0000
Authentication-Results: spf=pass (sender IP is 5.189.165.135)
 smtp.mailfrom=trideja.si; mydomain.com; dkim=pass (signature was verified)
 header.d=trideja.si;mydomain.com; dmarc=pass action=none
 header.from=trideja.si;compauth=pass reason=100
Received-SPF: Pass (protection.outlook.com: domain of trideja.si designates
 5.189.165.135 as permitted sender) receiver=protection.outlook.com;
 client-ip=5.189.165.135; helo=box.aero145.si;
Received: from box.aero145.si (5.189.165.135) by
 VE1EUR01FT061.mail.protection.outlook.com (10.152.3.81) with Microsoft SMTP
 Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
 15.20.3933.31 via Frontend Transport; Mon, 15 Mar 2021 09:29:08 +0000
Received: from authenticated-user (box.aero145.si [5.189.165.135])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by box.aero145.si (Postfix) with ESMTPSA id 59E6384005D
	for <myemail@mydomain.com>; Mon, 15 Mar 2021 10:29:07 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=trideja.si; s=mail;
	t=1615800547; bh=l1EJeEQuT1fnSnMa2nU8HOkNs+7OwdPD4c4pYNRkrKc=;
	h=From:To:Subject:Date:From;
	b=YZvk16ifFnlNCmpdwDyMjdH9tE3HFtbEbZuG5rwafClUWI/kv3T8zdx5yHffhUQ6w
	 I+przSLwXLih3Fa9ag7B02kX30RnrzKBfKlxD0csQba/m1BfjIy+gBkvyIr6NXFYz8
	 oltf7BXhI6YZZyD94nUrtR58VOnwlrN4BLFvDsEroO41eQ/zi+ckv2ghrlVlH/yukC
	 mnX7nbaRo5qpd8obEIRBW4QFZWTBntugT3KjQ0B29iYz4A+avD4AqCMC6emqKqEsis
	 ACeVq80PQcG5p5eF2nJioyZqVkqGb107QAqL9RB+kYM5DBipfuIqaCxf4Ti7toFZ7A
	 lpdJjnssL/XYw==
From: <lovro.sambol@trideja.si>
To: <myemail@mydomain.com>
Subject: test
Date: Mon, 15 Mar 2021 10:29:06 +0100
Message-ID: <001a01d7197d$a5c904e0$f15b0ea0$@trideja.si>
MIME-Version: 1.0
Content-Type: text/plain
Thread-Index: AdcZfaIy6RfN6vwNSBqhSCzrJB+FAg==
Content-Language: en-si
Return-Path: lovro.sambol@trideja.si
X-EOPAttributedMessage: 0
X-EOPTenantAttributedMessage: 39d6d41d-c7ca-4a42-ae3b-0fba82be994b:0
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: 06fe852e-7ba3-4cb7-23d8-08d8e794c942
X-MS-TrafficTypeDiagnostic: AM5PR03MB3074:
VE1EUR01HT081:
X-MS-Exchange-AtpMessageProperties: SA
SL
X-MS-Oob-TLC-OOBClassifiers: OLM:1728;
X-Forefront-Antispam-Report:
 CIP:5.189.165.135;CTRY:DE;LANG:en;SCL:5;SRV:;IPV:NLI;SFV:SPM;H:box.aero145.si;PTR:box.aero145.si;CAT:SPM;SFS:(4636009)(44736005)(2876002)(6966003)(7596003)(86362001)(26005)(36756003)(3480700007)(1420700001)(33964004)(6266002)(356005)(6916009)(5660300002)(336012)(956004)(2616005)(58800400005)(1096003)(7116003)(22186003)(7636003)(4006050)(75640400001)(8676002)(35310200010)(220243001);DIR:INB;
X-Microsoft-Antispam: BCL:0;
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X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR03MB3074
X-EopAttribution-RoutedToQuarantineCount: 0
X-MS-Exchange-Transport-CrossTenantHeadersStripped:
 VE1EUR01FT024.eop-EUR01.prod.protection.outlook.com
X-OriginatorOrg: mycompany.onmicrosoft.com

UCEPROTECT Blacklist Policy LEVEL 3 explanation is here UCEPROTECT®-Network - Spam protection made in Switzerland

I do not know what you used in the body of your email … but most larger email providers will send emails with the subject test to spam.

Always use a legit subject and body when doing a test email, never ever just ‘test’ and ‘test’. For example:

Subj: Just experimenting

Body: I need to determine if this is working ok. Please advise.

Thanks!

Or something brief but more involved than just ‘test’.

Also please check for blacklists:

https://multirbl.valli.org/dnsbl-lookup/5.189.165.135.html

Are all of your domains .si domains or are there other TLD’s in use as well??

HI Alento I give it another try as proposed with same result.

Received: from VE1EUR01FT018.eop-EUR01.prod.protection.outlook.com

(2a01:111:e400:7e19::4b) by

VE1EUR01HT233.eop-EUR01.prod.protection.outlook.com (2a01:111:e400:7e19::494)

with Microsoft SMTP Server (version=TLS1_2,

cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3933.30; Mon, 15 Mar

2021 19:04:04 +0000

Received: from EUR01-VE1-obe.outbound.protection.outlook.com (104.47.1.76) by

VE1EUR01FT018.mail.protection.outlook.com (10.152.2.221) with Microsoft SMTP

Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id

15.20.3933.31 via Frontend Transport; Mon, 15 Mar 2021 19:04:04 +0000

Received: from DB6P193CA0001.EURP193.PROD.OUTLOOK.COM (2603:10a6:6:29::11) by

PR3PR03MB6618.eurprd03.prod.outlook.com (2603:10a6:102:71::12) with Microsoft

SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id

15.20.3933.32; Mon, 15 Mar 2021 19:03:51 +0000

Received: from DB5EUR01FT019.eop-EUR01.prod.protection.outlook.com

(2603:10a6:6:29:cafe::80) by DB6P193CA0001.outlook.office365.com

(2603:10a6:6:29::11) with Microsoft SMTP Server (version=TLS1_2,

cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3933.31 via Frontend

Transport; Mon, 15 Mar 2021 19:03:51 +0000

Authentication-Results: spf=pass (sender IP is 5.189.165.135)

smtp.mailfrom=trideja.si; mydomain.com.com; dkim=pass (signature was verified)

header.d=trideja.si;mydomain.com.com; dmarc=pass action=none

header.from=trideja.si;compauth=pass reason=100

Received-SPF: Pass (protection.outlook.com: domain of trideja.si designates

5.189.165.135 as permitted sender) receiver=protection.outlook.com;

client-ip=5.189.165.135; helo=box.aero145.si;

Received: from box.aero145.si (5.189.165.135) by

DB5EUR01FT019.mail.protection.outlook.com (10.152.4.249) with Microsoft SMTP

Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id

15.20.3933.30 via Frontend Transport; Mon, 15 Mar 2021 19:03:50 +0000

Received: from authenticated-user (box.aero145.si [5.189.165.135])

(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))

(No client certificate requested)

by box.aero145.si (Postfix) with ESMTPSA id 7A183840046

for <ziga.mihajlovic@mydomain.com.com>; Mon, 15 Mar 2021 20:03:48 +0100 (CET)

DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=trideja.si; s=mail;

t=1615835028; bh=aRSF5Uef7HNp2BrYh+x9eTkHI1Et6YjhNGF8PWxfIQQ=;

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zD0nxMt6EQvjxrKxVU2Fsni60MBnvsxyjQfYeDsxEW9uJ9602mtnteihFLW6cv1fjP

NGlpq0VoqA9sw==

From: <lovro.sambol@trideja.si>

To: <ziga@mydomain.com.com>

Subject: Ponudba

Date: Mon, 15 Mar 2021 20:03:48 +0100

Message-ID: <004701d719cd$ee5c3790$cb14a6b0$@trideja.si>

MIME-Version: 1.0

Content-Type: text/plain

Thread-Index: AdcZzYWxcuJ+shJmQj+M48cYjZFVBw==

Content-Language: en-si

Return-Path: lovro.sambol@trideja.si

X-EOPAttributedMessage: 0

X-EOPTenantAttributedMessage: 39d6d41d-c7ca-4a42-ae3b-0fba82be994b:0

X-MS-PublicTrafficType: Email

X-MS-Office365-Filtering-Correlation-Id: 596d45dd-7f7c-478e-51f7-08d8e7e511cb

X-MS-TrafficTypeDiagnostic: PR3PR03MB6618:

VE1EUR01HT233:

X-MS-Exchange-AtpMessageProperties: SA

SL

X-MS-Oob-TLC-OOBClassifiers: OLM:2089;

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X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR3PR03MB6618

X-EopAttribution-RoutedToQuarantineCount: 0

X-MS-Exchange-Transport-CrossTenantHeadersStripped:

VE1EUR01FT018.eop-EUR01.prod.protection.outlook.com

X-OriginatorOrg: mydomain.com.onmicrosoft.com

Hi Team,

I am still struggling and trying to identify why one of my domains is getting in to spam

Just to update on this domain I had two email users. And I have asked both to sent me the email to my company email where they used MS OFFICE 365. One email came in OK the other one was marked with spam. I then created a new email account on that domain and again it was send to spam.

On MXTOOLBOX spam analyze I have dropped in the message header and I got a result -4 out of 5

Even on the report below it is stated that system has not identify it as SPAM. is this now a reputation issue?

Is it possible that there is an issue with IP6 as I have that one enabled ?

-4.8/5.0
Spam detection software, running on the system "ip-10-2-10-203.ec2.internal",
has NOT identified this incoming email as spam.  The original
message has been attached to this so you can view it or label
similar future email.  If you have any questions, see
the administrator of that system for details.

Content preview:  [...] 

Content analysis details:   (-4.8 points, 5.0 required)

 pts rule name              description
---- ---------------------- --------------------------------------------------
-5.0 RCVD_IN_DNSWL_HI       RBL: Sender listed at https://www.dnswl.org/, high
                            trust
                            [2a01:111:e400:7e18:0:0:0:50 listed in]
                            [list.dnswl.org]
 0.1 DKIM_SIGNED            Message has a DKIM or DK signature, not necessarily valid
 0.1 DKIM_INVALID           DKIM or DK signature exists, but is not valid
 0.0 TVD_SPACE_RATIO        No description available.

Yes. Whenever possible, disable IPv6.