Mailing List Archive

MS-relayed spam
Hi all,

Full headers are here as well: https://pastebin.com/wHNmnvtE

I'm not really following what's going on here - a few things confuse me...

- the empty from envelope, which I thought was more of a "bounce" thing
- that it does seem formatted like a bounce
- across multiple servers I'm seeing a ton more spam just like this the past few weeks coming in via MS
- I had assumed that MS (or gmail, or any large provider) would be a bit more tuned to this kind of abuse

Anyone else seeing this and if so, what mitigations are you doing in SA?

To me, it appears that a company with some kind of on-prem email server is using MS' inbound/outbound filtering/relaying for their email, and I'm assuming that the company (acquiretm dot com) has compromised account(s) being used for spam, and that this type of account is valuable since it's relayed through a somewhat "trusted" entity (MS). Stumped on the empty envelope from though...

Thanks,

Charles


Full headers inline:

Return-Path: <MAILER-DAEMON>
Delivered-To: MYEMAIL@MYDOMAIN.COM
Received: from mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.2])
by mail.MYDOMAIN.COM (Postfix) with ESMTP id 62E4ACCE44
for <MYEMAIL@MYDOMAIN.COM>; Mon, 1 Jan 2024 14:23:33 -0500 (EST)
X-Virus-Scanned: amavisd-new at MYDOMAIN.COM
X-Spam-Flag: NO
X-Spam-Score: 3.971
X-Spam-Level: ***
X-Spam-Status: No, score=3.971 tagged_above=-100 required=6.2
tests=[.ARC_SIGNED=0.001, ARC_VALID=0.001, BAYES_00=-1.9,
DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,
FORGED_SPF_HELO=1, FREEMAIL_FROM=0.001, FROM_LOCAL_NOVOWEL=0.5,
HK_RANDOM_FROM=0.001, HTML_IMAGE_ONLY_24=1.618, HTML_MESSAGE=0.001,
MIME_HTML_ONLY=0.1, RCVD_IN_DNSWL_NONE=-0.0001,
RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_RPBL=1.31,
SCC_BODY_URI_ONLY=1.44, SPF_HELO_PASS=-0.001, T_REMOTE_IMAGE=0.01,
T_SCC_BODY_TEXT_LINE=-0.01] autolearn=no autolearn_force=no
Received: from mail.MYDOMAIN.COM ([207.99.1.2])
by mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.]) (amavisd-new, port 10024)
with ESMTP id y8UwjrBjDDCO for <MYEMAIL@MYDOMAIN.COM>;
Mon, 1 Jan 2024 14:23:31 -0500 (EST)
Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11hn2245.outbound.protection.outlook.com [52.100.172.245])
(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by mail.MYDOMAIN.COM (Postfix) with ESMTPS id 731A6CCE43
for <MYEMAIL@MYDOMAIN.COM>; Mon, 1 Jan 2024 14:23:31 -0500 (EST)
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
b=Icl1NbdVBzy5nVKV4XGHyD5lhcUdtzirTQuOX40QfE0Qb4eogob5tBOWT7T7oxZ6O7oogwqarlyCmJXZfKwxDknw8W/1q9UzYGmNu0vt9l/C/TAQGHd2qdDo7k/S5rA/VkvSbwsWsPlPzHM5gpPvERtV1AwGRibQFb7IAJkW1bL6aTyG8R2JHPyDtSE5hG+0/XFuct7sSqoyr8J1hv7cOP6ZsOmlfLFuKxYoAEqFdi0qCsQD/CjfFzFNcaj9Sas09hbA1E/lEU5lf43EJFPOUX9ieGQA292aleu0PO2lqaU+TOwrr9UdnSHPyo89vQUHCiMd9+4ZMb51dxkvx6dLWQ==
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=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
b=gBRRLW2K0klYaRjOr+bNZO7zS3m+Kb+mkggilqYBqELoa12h3G5gwGFye+aLoJjtPSDnS1d0/GUkPYWm2/JlQZtoKmq4YAqwA4tnT2HYRcckobGDbhOcaop7wKmcQutiBxdr2iG8Hjmbvkf6jkP2AHL9kVqZv73Byv60sg1djmVaNHR+2qJd3vyQ3kepYsngd9QtdsyjjFBb+VjyItwaijKmjO4IBSIr4X5i5CmK+v67YoalMVjoXnKaMEpK/4Qh3Eh5zyzGHjdT7+QzK/T4cDSu+1XA+rHcK7G4/BTwLRs+NBTOYMT52Zr4eo5462nuo/ITG3+SjPM9g8QXkfJ06Q==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none (sender ip is
193.176.158.140) smtp.rcpttodomain=MYDOMAIN.COM smtp.helo=mail.acquiretm.com;
dmarc=none action=none header.from=x1r862t.onmicrosoft.com; dkim=none
(message not signed); arc=none (0)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=x1r862t.onmicrosoft.com; s=selector1-x1r862t-onmicrosoft-com;
h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
bh=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
b=R1X4dpKSgryTH6OLmMzRy/tDWLnQEV8mHOEEtjH+lXKLhUWP1IcSU7ti48ZJoXOksGz7A4+ZbSb5s1wNp2A4dGS+psXMeDNERbCeNVeGFRy/0AfJX4BSO52imrh48OaXFvTjmcrwSondZQkeC2plLlatu2jWPXn+a48T+gCuUZtFOpy6+1OlQqtOhQd5Ork4w7yD6nIicaXcQ4GhpDX1YM6zU02EUOSl+pxEgJj5/WuHvXNbtuTmdsGid1JhRnmIyvR15jGzXHkyrD/KYHw3evZSOV8pJ8EMpUPDEiwdHjDGYt38j/Wwiho5yVfR/zNZa5wELOq9bYgLK0G91JywQA==
X-MS-Exchange-Authentication-Results: spf=none (sender IP is 193.176.158.140)
smtp.helo=mail.acquiretm.com; dkim=none (message not signed)
header.d=none;dmarc=none action=none header.from=x1r862t.onmicrosoft.com;
Date: Mon, 01 Jan 2024 20:19:49 +0100
Importance: high
Subject: Your iCloud Storage Is Full. Receive 50 GB for FREE
X-TOI-MSGID: <1660898088.4BDAB4AB9E89D.1704136789437@acquiretm.com>
In-Reply-To: <952HtCJGcsDXt5hYdIx5kfocgsAN34o2GPHcYVpB6@egw.x1r862t.onmicrosoft.com>
Content-Type: text/html; charset="UTF-8"
CC: MYEMAIL@MYDOMAIN.COM
To: MYEMAIL@MYDOMAIN.COM
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Storage Notice <info_QwzrlPCPwPQ@x1r862t.onmicrosoft.com>
Message-ID:
<0e3b3785-6682-4c22-b6d7-87286c342cd7@CY4PEPF0000EE34.namprd05.prod.outlook.com>
X-EOPAttributedMessage: 0
X-MS-PublicTrafficType: Email
X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE34:EE_|CO6PR20MB3698:EE_
X-MS-Office365-Filtering-Correlation-Id: 3b787f74-e97d-4744-853e-08dc0aff1ea0
X-MS-Exchange-SenderADCheck: 1
X-MS-Exchange-AntiSpam-Relay: 0
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info:

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
X-Forefront-Antispam-Report:
CIP:193.176.158.140;CTRY:FR;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.acquiretm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(136003)(346002)(376002)(396003)(39860400002)(230922051799003)(61400799012)(1690799017)(451199024)(7200799017)(64100799003)(82310400011)(46966006)(8400799017)(3082699003)(40480700001)(336012)(42882007)(26005)(41320700001)(31696002)(81166007)(558084003)(166002)(82740400003)(17440700003)(35950700001)(34020700004)(47076005)(4326008)(67280400001)(19625305002)(5660300002)(9686003)(8936002)(8676002)(70206006)(70586007)(786003)(78352004)(316002)(6916009)(42186006)(2906002)(41300700001)(498600001)(84603001)(42472002)(38122002);DIR:OUT;SFP:1501;
X-OriginatorOrg: x1r862t.onmicrosoft.com
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jan 2024 19:23:21.7479
(UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 3b787f74-e97d-4744-853e-08dc0aff1ea0
X-MS-Exchange-CrossTenant-Id: aae3bce2-b5e6-4c64-9336-2909094ee8c9
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=aae3bce2-b5e6-4c64-9336-2909094ee8c9;Ip=[193.176.158.140];Helo=[mail.acquiretm.com]
X-MS-Exchange-CrossTenant-AuthSource:
CY4PEPF0000EE34.namprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR20MB3698
Re: MS-relayed spam [ In reply to ]
I would report this to Microsoft Abuse and setup local rules that add a point or two something like this:

header BAD_O365_SENDER X-OriginatorOrg =~ /.*\.onmicrosoft\.com$/

With a threshold of 6.2, you might want to consider either lowering that a little or bumping up some default scores for some of the "worse" rules.

Most legit senders should not be using their onmicrosoft.com for their primary address but there are a few that I have seen over the years so I also have a counter rule to subtract a point or two for specific onmicrosoft.com subdomains.

?On 1/1/24, 3:29 PM, "Charles Sprickman" <spork@bway.net <mailto:spork@bway.net>> wrote:


EXTERNAL EMAIL: This message originated outside of ENA. Use caution when clicking links, opening attachments, or complying with requests. Click the "Phish Alert Report" button above the email, or contact MIS, regarding any suspicious message.

Hi all,

Full headers are here as well: https://pastebin.com/wHNmnvtE <https://pastebin.com/wHNmnvtE>

I'm not really following what's going on here - a few things confuse me...

- the empty from envelope, which I thought was more of a "bounce" thing
- that it does seem formatted like a bounce
- across multiple servers I'm seeing a ton more spam just like this the past few weeks coming in via MS
- I had assumed that MS (or gmail, or any large provider) would be a bit more tuned to this kind of abuse

Anyone else seeing this and if so, what mitigations are you doing in SA?

To me, it appears that a company with some kind of on-prem email server is using MS' inbound/outbound filtering/relaying for their email, and I'm assuming that the company (acquiretm dot com) has compromised account(s) being used for spam, and that this type of account is valuable since it's relayed through a somewhat "trusted" entity (MS). Stumped on the empty envelope from though...

Thanks,
Charles

Full headers inline:


Return-Path: <MAILER-DAEMON>
Delivered-To: MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>
Received: from mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.2])
by mail.MYDOMAIN.COM (Postfix) with ESMTP id 62E4ACCE44
for <MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>>; Mon, 1 Jan 2024 14:23:33 -0500 (EST)
X-Virus-Scanned: amavisd-new at MYDOMAIN.COM
X-Spam-Flag: NO
X-Spam-Score: 3.971
X-Spam-Level: ***
X-Spam-Status: No, score=3.971 tagged_above=-100 required=6.2
tests=[.ARC_SIGNED=0.001, ARC_VALID=0.001, BAYES_00=-1.9,
DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,
FORGED_SPF_HELO=1, FREEMAIL_FROM=0.001, FROM_LOCAL_NOVOWEL=0.5,
HK_RANDOM_FROM=0.001, HTML_IMAGE_ONLY_24=1.618, HTML_MESSAGE=0.001,
MIME_HTML_ONLY=0.1, RCVD_IN_DNSWL_NONE=-0.0001,
RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_RPBL=1.31,
SCC_BODY_URI_ONLY=1.44, SPF_HELO_PASS=-0.001, T_REMOTE_IMAGE=0.01,
T_SCC_BODY_TEXT_LINE=-0.01] autolearn=no autolearn_force=no
Received: from mail.MYDOMAIN.COM ([207.99.1.2])
by mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.]) (amavisd-new, port 10024)
with ESMTP id y8UwjrBjDDCO for <MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>>;
Mon, 1 Jan 2024 14:23:31 -0500 (EST)
Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11hn2245.outbound.protection.outlook.com [52.100.172.245])
(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by mail.MYDOMAIN.COM (Postfix) with ESMTPS id 731A6CCE43
for <MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>>; Mon, 1 Jan 2024 14:23:31 -0500 (EST)
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
b=Icl1NbdVBzy5nVKV4XGHyD5lhcUdtzirTQuOX40QfE0Qb4eogob5tBOWT7T7oxZ6O7oogwqarlyCmJXZfKwxDknw8W/1q9UzYGmNu0vt9l/C/TAQGHd2qdDo7k/S5rA/VkvSbwsWsPlPzHM5gpPvERtV1AwGRibQFb7IAJkW1bL6aTyG8R2JHPyDtSE5hG+0/XFuct7sSqoyr8J1hv7cOP6ZsOmlfLFuKxYoAEqFdi0qCsQD/CjfFzFNcaj9Sas09hbA1E/lEU5lf43EJFPOUX9ieGQA292aleu0PO2lqaU+TOwrr9UdnSHPyo89vQUHCiMd9+4ZMb51dxkvx6dLWQ==
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=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
b=gBRRLW2K0klYaRjOr+bNZO7zS3m+Kb+mkggilqYBqELoa12h3G5gwGFye+aLoJjtPSDnS1d0/GUkPYWm2/JlQZtoKmq4YAqwA4tnT2HYRcckobGDbhOcaop7wKmcQutiBxdr2iG8Hjmbvkf6jkP2AHL9kVqZv73Byv60sg1djmVaNHR+2qJd3vyQ3kepYsngd9QtdsyjjFBb+VjyItwaijKmjO4IBSIr4X5i5CmK+v67YoalMVjoXnKaMEpK/4Qh3Eh5zyzGHjdT7+QzK/T4cDSu+1XA+rHcK7G4/BTwLRs+NBTOYMT52Zr4eo5462nuo/ITG3+SjPM9g8QXkfJ06Q==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none (sender ip is
193.176.158.140) smtp.rcpttodomain=MYDOMAIN.COM smtp.helo=mail.acquiretm.com;
dmarc=none action=none header.from=x1r862t.onmicrosoft.com; dkim=none
(message not signed); arc=none (0)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=x1r862t.onmicrosoft.com; s=selector1-x1r862t-onmicrosoft-com;
h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
bh=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
b=R1X4dpKSgryTH6OLmMzRy/tDWLnQEV8mHOEEtjH+lXKLhUWP1IcSU7ti48ZJoXOksGz7A4+ZbSb5s1wNp2A4dGS+psXMeDNERbCeNVeGFRy/0AfJX4BSO52imrh48OaXFvTjmcrwSondZQkeC2plLlatu2jWPXn+a48T+gCuUZtFOpy6+1OlQqtOhQd5Ork4w7yD6nIicaXcQ4GhpDX1YM6zU02EUOSl+pxEgJj5/WuHvXNbtuTmdsGid1JhRnmIyvR15jGzXHkyrD/KYHw3evZSOV8pJ8EMpUPDEiwdHjDGYt38j/Wwiho5yVfR/zNZa5wELOq9bYgLK0G91JywQA==
X-MS-Exchange-Authentication-Results: spf=none (sender IP is 193.176.158.140)
smtp.helo=mail.acquiretm.com; dkim=none (message not signed)
header.d=none;dmarc=none action=none header.from=x1r862t.onmicrosoft.com;
Date: Mon, 01 Jan 2024 20:19:49 +0100
Importance: high
Subject: Your iCloud Storage Is Full. Receive 50 GB for FREE
X-TOI-MSGID: <1660898088.4BDAB4AB9E89D.1704136789437@acquiretm.com <mailto:1660898088.4BDAB4AB9E89D.1704136789437@acquiretm.com>>
In-Reply-To: <952HtCJGcsDXt5hYdIx5kfocgsAN34o2GPHcYVpB6@egw.x1r862t.onmicrosoft.com <mailto:952HtCJGcsDXt5hYdIx5kfocgsAN34o2GPHcYVpB6@egw.x1r862t.onmicrosoft.com>>
Content-Type: text/html; charset="UTF-8"
CC: MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>
To: MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Storage Notice <info_QwzrlPCPwPQ@x1r862t.onmicrosoft.com <mailto:info_QwzrlPCPwPQ@x1r862t.onmicrosoft.com>>
Message-ID:
<0e3b3785-6682-4c22-b6d7-87286c342cd7@CY4PEPF0000EE34.namprd05.prod.outlook.com <mailto:0e3b3785-6682-4c22-b6d7-87286c342cd7@CY4PEPF0000EE34.namprd05.prod.outlook.com>>
X-EOPAttributedMessage: 0
X-MS-PublicTrafficType: Email
X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE34:EE_|CO6PR20MB3698:EE_
X-MS-Office365-Filtering-Correlation-Id: 3b787f74-e97d-4744-853e-08dc0aff1ea0
X-MS-Exchange-SenderADCheck: 1
X-MS-Exchange-AntiSpam-Relay: 0
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info:


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
X-Forefront-Antispam-Report:
CIP:193.176.158.140;CTRY:FR;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.acquiretm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(136003)(346002)(376002)(396003)(39860400002)(230922051799003)(61400799012)(1690799017)(451199024)(7200799017)(64100799003)(82310400011)(46966006)(8400799017)(3082699003)(40480700001)(336012)(42882007)(26005)(41320700001)(31696002)(81166007)(558084003)(166002)(82740400003)(17440700003)(35950700001)(34020700004)(47076005)(4326008)(67280400001)(19625305002)(5660300002)(9686003)(8936002)(8676002)(70206006)(70586007)(786003)(78352004)(316002)(6916009)(42186006)(2906002)(41300700001)(498600001)(84603001)(42472002)(38122002);DIR:OUT;SFP:1501;
X-OriginatorOrg: x1r862t.onmicrosoft.com
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jan 2024 19:23:21.7479
(UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 3b787f74-e97d-4744-853e-08dc0aff1ea0
X-MS-Exchange-CrossTenant-Id: aae3bce2-b5e6-4c64-9336-2909094ee8c9
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=aae3bce2-b5e6-4c64-9336-2909094ee8c9;Ip=[193.176.158.140];Helo=[mail.acquiretm.com]
X-MS-Exchange-CrossTenant-AuthSource:
CY4PEPF0000EE34.namprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR20MB3698
Re: MS-relayed spam [ In reply to ]
On 01.01.24 16:28, Charles Sprickman wrote:
>Full headers are here as well: https://pastebin.com/wHNmnvtE

neither indicate that the mail was relayes by microsoft.
Isn't this just backscatter, non-delivery notice on fake mail?

>I'm not really following what's going on here - a few things confuse me...
>
> - the empty from envelope, which I thought was more of a "bounce" thing
> - that it does seem formatted like a bounce
> - across multiple servers I'm seeing a ton more spam just like this the past few weeks coming in via MS
> - I had assumed that MS (or gmail, or any large provider) would be a bit more tuned to this kind of abuse
>
>Anyone else seeing this and if so, what mitigations are you doing in SA?
>
>To me, it appears that a company with some kind of on-prem email server is using MS' inbound/outbound filtering/relaying for their email, and I'm assuming that the company (acquiretm dot com) has compromised account(s) being used for spam, and that this type of account is valuable since it's relayed through a somewhat "trusted" entity (MS). Stumped on the empty envelope from though...
>
>Thanks,
>
>Charles
>
>
>Full headers inline:
>
>Return-Path: <MAILER-DAEMON>
>Delivered-To: MYEMAIL@MYDOMAIN.COM
>Received: from mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.2])
>by mail.MYDOMAIN.COM (Postfix) with ESMTP id 62E4ACCE44
>for <MYEMAIL@MYDOMAIN.COM>; Mon, 1 Jan 2024 14:23:33 -0500 (EST)
>X-Virus-Scanned: amavisd-new at MYDOMAIN.COM
>X-Spam-Flag: NO
>X-Spam-Score: 3.971
>X-Spam-Level: ***
>X-Spam-Status: No, score=3.971 tagged_above=-100 required=6.2
>tests=[.ARC_SIGNED=0.001, ARC_VALID=0.001, BAYES_00=-1.9,
>DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,
>FORGED_SPF_HELO=1, FREEMAIL_FROM=0.001, FROM_LOCAL_NOVOWEL=0.5,
>HK_RANDOM_FROM=0.001, HTML_IMAGE_ONLY_24=1.618, HTML_MESSAGE=0.001,
>MIME_HTML_ONLY=0.1, RCVD_IN_DNSWL_NONE=-0.0001,
>RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_RPBL=1.31,
>SCC_BODY_URI_ONLY=1.44, SPF_HELO_PASS=-0.001, T_REMOTE_IMAGE=0.01,
>T_SCC_BODY_TEXT_LINE=-0.01] autolearn=no autolearn_force=no
>Received: from mail.MYDOMAIN.COM ([207.99.1.2])
>by mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.]) (amavisd-new, port 10024)
>with ESMTP id y8UwjrBjDDCO for <MYEMAIL@MYDOMAIN.COM>;
>Mon, 1 Jan 2024 14:23:31 -0500 (EST)
>Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11hn2245.outbound.protection.outlook.com [52.100.172.245])
>(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))
>(No client certificate requested)
>by mail.MYDOMAIN.COM (Postfix) with ESMTPS id 731A6CCE43
>for <MYEMAIL@MYDOMAIN.COM>; Mon, 1 Jan 2024 14:23:31 -0500 (EST)
>ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
>b=Icl1NbdVBzy5nVKV4XGHyD5lhcUdtzirTQuOX40QfE0Qb4eogob5tBOWT7T7oxZ6O7oogwqarlyCmJXZfKwxDknw8W/1q9UzYGmNu0vt9l/C/TAQGHd2qdDo7k/S5rA/VkvSbwsWsPlPzHM5gpPvERtV1AwGRibQFb7IAJkW1bL6aTyG8R2JHPyDtSE5hG+0/XFuct7sSqoyr8J1hv7cOP6ZsOmlfLFuKxYoAEqFdi0qCsQD/CjfFzFNcaj9Sas09hbA1E/lEU5lf43EJFPOUX9ieGQA292aleu0PO2lqaU+TOwrr9UdnSHPyo89vQUHCiMd9+4ZMb51dxkvx6dLWQ==
>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=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
>b=gBRRLW2K0klYaRjOr+bNZO7zS3m+Kb+mkggilqYBqELoa12h3G5gwGFye+aLoJjtPSDnS1d0/GUkPYWm2/JlQZtoKmq4YAqwA4tnT2HYRcckobGDbhOcaop7wKmcQutiBxdr2iG8Hjmbvkf6jkP2AHL9kVqZv73Byv60sg1djmVaNHR+2qJd3vyQ3kepYsngd9QtdsyjjFBb+VjyItwaijKmjO4IBSIr4X5i5CmK+v67YoalMVjoXnKaMEpK/4Qh3Eh5zyzGHjdT7+QzK/T4cDSu+1XA+rHcK7G4/BTwLRs+NBTOYMT52Zr4eo5462nuo/ITG3+SjPM9g8QXkfJ06Q==
>ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none (sender ip is
>193.176.158.140) smtp.rcpttodomain=MYDOMAIN.COM smtp.helo=mail.acquiretm.com;
>dmarc=none action=none header.from=x1r862t.onmicrosoft.com; dkim=none
>(message not signed); arc=none (0)
>DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
>d=x1r862t.onmicrosoft.com; s=selector1-x1r862t-onmicrosoft-com;
>h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
>bh=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
>b=R1X4dpKSgryTH6OLmMzRy/tDWLnQEV8mHOEEtjH+lXKLhUWP1IcSU7ti48ZJoXOksGz7A4+ZbSb5s1wNp2A4dGS+psXMeDNERbCeNVeGFRy/0AfJX4BSO52imrh48OaXFvTjmcrwSondZQkeC2plLlatu2jWPXn+a48T+gCuUZtFOpy6+1OlQqtOhQd5Ork4w7yD6nIicaXcQ4GhpDX1YM6zU02EUOSl+pxEgJj5/WuHvXNbtuTmdsGid1JhRnmIyvR15jGzXHkyrD/KYHw3evZSOV8pJ8EMpUPDEiwdHjDGYt38j/Wwiho5yVfR/zNZa5wELOq9bYgLK0G91JywQA==
>X-MS-Exchange-Authentication-Results: spf=none (sender IP is 193.176.158.140)
>smtp.helo=mail.acquiretm.com; dkim=none (message not signed)
>header.d=none;dmarc=none action=none header.from=x1r862t.onmicrosoft.com;
>Date: Mon, 01 Jan 2024 20:19:49 +0100
>Importance: high
>Subject: Your iCloud Storage Is Full. Receive 50 GB for FREE
>X-TOI-MSGID: <1660898088.4BDAB4AB9E89D.1704136789437@acquiretm.com>
>In-Reply-To: <952HtCJGcsDXt5hYdIx5kfocgsAN34o2GPHcYVpB6@egw.x1r862t.onmicrosoft.com>
>Content-Type: text/html; charset="UTF-8"
>CC: MYEMAIL@MYDOMAIN.COM
>To: MYEMAIL@MYDOMAIN.COM
>MIME-Version: 1.0
>Content-Transfer-Encoding: 7bit
>From: Storage Notice <info_QwzrlPCPwPQ@x1r862t.onmicrosoft.com>
>Message-ID:
><0e3b3785-6682-4c22-b6d7-87286c342cd7@CY4PEPF0000EE34.namprd05.prod.outlook.com>
>X-EOPAttributedMessage: 0
>X-MS-PublicTrafficType: Email
>X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE34:EE_|CO6PR20MB3698:EE_
>X-MS-Office365-Filtering-Correlation-Id: 3b787f74-e97d-4744-853e-08dc0aff1ea0
>X-MS-Exchange-SenderADCheck: 1
>X-MS-Exchange-AntiSpam-Relay: 0
>X-Microsoft-Antispam: BCL:0;
>X-Microsoft-Antispam-Message-Info:
>
>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
>X-Forefront-Antispam-Report:
>CIP:193.176.158.140;CTRY:FR;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.acquiretm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(136003)(346002)(376002)(396003)(39860400002)(230922051799003)(61400799012)(1690799017)(451199024)(7200799017)(64100799003)(82310400011)(46966006)(8400799017)(3082699003)(40480700001)(336012)(42882007)(26005)(41320700001)(31696002)(81166007)(558084003)(166002)(82740400003)(17440700003)(35950700001)(34020700004)(47076005)(4326008)(67280400001)(19625305002)(5660300002)(9686003)(8936002)(8676002)(70206006)(70586007)(786003)(78352004)(316002)(6916009)(42186006)(2906002)(41300700001)(498600001)(84603001)(42472002)(38122002);DIR:OUT;SFP:1501;
>X-OriginatorOrg: x1r862t.onmicrosoft.com
>X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jan 2024 19:23:21.7479
>(UTC)
>X-MS-Exchange-CrossTenant-Network-Message-Id: 3b787f74-e97d-4744-853e-08dc0aff1ea0
>X-MS-Exchange-CrossTenant-Id: aae3bce2-b5e6-4c64-9336-2909094ee8c9
>X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=aae3bce2-b5e6-4c64-9336-2909094ee8c9;Ip=[193.176.158.140];Helo=[mail.acquiretm.com]
>X-MS-Exchange-CrossTenant-AuthSource:
>CY4PEPF0000EE34.namprd05.prod.outlook.com
>X-MS-Exchange-CrossTenant-AuthAs: Anonymous
>X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
>X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR20MB3698

--
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Remember half the people you know are below average.
Re: MS-relayed spam [ In reply to ]
On 2024-01-01 at 16:28:04 UTC-0500 (Mon, 1 Jan 2024 16:28:04 -0500)
Charles Sprickman <spork@bway.net>
is rumored to have said:

> Hi all,
>
> Full headers are here as well: https://pastebin.com/wHNmnvtE
>
> I'm not really following what's going on here - a few things confuse
> me...
>
> - the empty from envelope, which I thought was more of a "bounce"
> thing

Yes. You can safely reject mail with a null sender that does not meet
norms for mail-system-generated mail.

> - that it does seem formatted like a bounce

Not in the headers... No one legit sends bounces with "Content-Type:
text/html" or with In-Reply-To headers without a References header or Cc
headers.

> - across multiple servers I'm seeing a ton more spam just like this
> the past few weeks coming in via MS

Everyone's spam is unique.

I see some similar stuff at various sites but nothing in the places
where I can really dig into details. I don't see much null sender spam
at all. I do see a few cases of $jjunk@$ggarbage.onmicrosoft.com senders
similar to the From: header in your example, but they are all getting
caught by SA.

> - I had assumed that MS (or gmail, or any large provider) would be a
> bit more tuned to this kind of abuse

By their own customers? Have you been paying any attention this century?

MS could kill this particular flavor of spam (identifiable by
correlating patterns in From and other headers) if they wanted to. They
CHOOSE as a corporation to be a bad neighbor as a matter of unstated
policy and unconscious strategy. In the same way a junkie chooses their
dope...

> Anyone else seeing this and if so, what mitigations are you doing in
> SA?

In the one place where I save SA-rejected mail, I see nothing with
"onmicrosoft.com" anywhere except in mail talking about this garbage. On
a larger system with less retained info I see some similar-ish messages
but nothing similar with null senders.

I don't see an obvious pattern of SA rule matches in the similar
messages that are being rejected on the systems I have access to. I also
see no null senders from MS hosts associated with UUID-like message-Id
local parts. Hmmm... that might be an interesting rule.

> To me, it appears that a company with some kind of on-prem email
> server is using MS' inbound/outbound filtering/relaying for their
> email, and I'm assuming that the company (acquiretm dot com) has
> compromised account(s) being used for spam,

Not sure how you got there...

Everywhere in those headers that I see that domain I also see it
attributed as the HELO from IP address 193.176.158.140, which has no
obvious connection to the domain. That IP address is allocated via RIPE,
but it might be in Russia, Estonia, Hong Kong, or France depending on
which registration records you think are relevant.

I'd bet that you could get a perfect score sniping that IP address in
the various MS attribution headers, but that probably will not be useful
for long.

> and that this type of account is valuable since it's relayed through a
> somewhat "trusted" entity (MS). Stumped on the empty envelope from
> though...

I assume that your system is turning <> into <MAILER-DAEMON>...

> Full headers inline:

My first-glance thoughts are embedded below.

>
> Return-Path: <MAILER-DAEMON>
[internal stuff snipped]
> Received: from NAM11-DM6-obe.outbound.protection.outlook.com
> (mail-dm6nam11hn2245.outbound.protection.outlook.com [52.100.172.245])
> (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256
> bits))
> (No client certificate requested)
> by mail.MYDOMAIN.COM (Postfix) with ESMTPS id 731A6CCE43
> for <MYEMAIL@MYDOMAIN.COM>; Mon, 1 Jan 2024 14:23:31 -0500 (EST)
> ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com;
> cv=none;
> b=Icl1NbdVBzy5nVKV4XGHyD5lhcUdtzirTQuOX40QfE0Qb4eogob5tBOWT7T7oxZ6O7oogwqarlyCmJXZfKwxDknw8W/1q9UzYGmNu0vt9l/C/TAQGHd2qdDo7k/S5rA/VkvSbwsWsPlPzHM5gpPvERtV1AwGRibQFb7IAJkW1bL6aTyG8R2JHPyDtSE5hG+0/XFuct7sSqoyr8J1hv7cOP6ZsOmlfLFuKxYoAEqFdi0qCsQD/CjfFzFNcaj9Sas09hbA1E/lEU5lf43EJFPOUX9ieGQA292aleu0PO2lqaU+TOwrr9UdnSHPyo89vQUHCiMd9+4ZMb51dxkvx6dLWQ==
> 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=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
> b=gBRRLW2K0klYaRjOr+bNZO7zS3m+Kb+mkggilqYBqELoa12h3G5gwGFye+aLoJjtPSDnS1d0/GUkPYWm2/JlQZtoKmq4YAqwA4tnT2HYRcckobGDbhOcaop7wKmcQutiBxdr2iG8Hjmbvkf6jkP2AHL9kVqZv73Byv60sg1djmVaNHR+2qJd3vyQ3kepYsngd9QtdsyjjFBb+VjyItwaijKmjO4IBSIr4X5i5CmK+v67YoalMVjoXnKaMEpK/4Qh3Eh5zyzGHjdT7+QzK/T4cDSu+1XA+rHcK7G4/BTwLRs+NBTOYMT52Zr4eo5462nuo/ITG3+SjPM9g8QXkfJ06Q==
> ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none (sender
> ip is
> 193.176.158.140) smtp.rcpttodomain=MYDOMAIN.COM
> smtp.helo=mail.acquiretm.com;
> dmarc=none action=none header.from=x1r862t.onmicrosoft.com; dkim=none
> (message not signed); arc=none (0)

Weird that this says the message wasn't signed when MS saw it...

> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
> d=x1r862t.onmicrosoft.com; s=selector1-x1r862t-onmicrosoft-com;
> h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
> bh=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
> b=R1X4dpKSgryTH6OLmMzRy/tDWLnQEV8mHOEEtjH+lXKLhUWP1IcSU7ti48ZJoXOksGz7A4+ZbSb5s1wNp2A4dGS+psXMeDNERbCeNVeGFRy/0AfJX4BSO52imrh48OaXFvTjmcrwSondZQkeC2plLlatu2jWPXn+a48T+gCuUZtFOpy6+1OlQqtOhQd5Ork4w7yD6nIicaXcQ4GhpDX1YM6zU02EUOSl+pxEgJj5/WuHvXNbtuTmdsGid1JhRnmIyvR15jGzXHkyrD/KYHw3evZSOV8pJ8EMpUPDEiwdHjDGYt38j/Wwiho5yVfR/zNZa5wELOq9bYgLK0G91JywQA==

When there's a signature. Which your SA says was good.

> X-MS-Exchange-Authentication-Results: spf=none (sender IP is
> 193.176.158.140)
> smtp.helo=mail.acquiretm.com; dkim=none (message not signed)
> header.d=none;dmarc=none action=none
> header.from=x1r862t.onmicrosoft.com;

Again, a bit weird... MS says there's no DKIM, but there is.

> Date: Mon, 01 Jan 2024 20:19:49 +0100
> Importance: high

Never a good sign...

> Subject: Your iCloud Storage Is Full. Receive 50 GB for FREE
> X-TOI-MSGID: <1660898088.4BDAB4AB9E89D.1704136789437@acquiretm.com>
> In-Reply-To:
> <952HtCJGcsDXt5hYdIx5kfocgsAN34o2GPHcYVpB6@egw.x1r862t.onmicrosoft.com>
> Content-Type: text/html; charset="UTF-8"
> CC: MYEMAIL@MYDOMAIN.COM
> To: MYEMAIL@MYDOMAIN.COM

An idiosyncrasy...

> MIME-Version: 1.0
> Content-Transfer-Encoding: 7bit
> From: Storage Notice <info_QwzrlPCPwPQ@x1r862t.onmicrosoft.com>

So, how many legit correspondents have email addresses matching
/info_[a-zA-Z]{11}@[a-z0-9]{7}.onmicrosoft.com/ and send your users
email?

> Message-ID:
> <0e3b3785-6682-4c22-b6d7-87286c342cd7@CY4PEPF0000EE34.namprd05.prod.outlook.com>
> X-EOPAttributedMessage: 0
> X-MS-PublicTrafficType: Email
> X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE34:EE_|CO6PR20MB3698:EE_

I'm guessing that CY4PEPF0000EE34 is an important identifier here.
Maybe CO6PR20MB3698 as well.
I'm not sure exactly what any of these X-* headers mean, as I'm not MS,
but if they are correlating nonces, I'm fine with that.

[...]
> X-OriginatorOrg: x1r862t.onmicrosoft.com

Ask yourself: Do I want email from non-paying Microsoft email customers?

If the answer is "NO!" then that header provides a hint at a strong
rule.

> X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jan 2024
> 19:23:21.7479
> (UTC)
> X-MS-Exchange-CrossTenant-Network-Message-Id:
> 3b787f74-e97d-4744-853e-08dc0aff1ea0
> X-MS-Exchange-CrossTenant-Id: aae3bce2-b5e6-4c64-9336-2909094ee8c9
> X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp:
> TenantId=aae3bce2-b5e6-4c64-9336-2909094ee8c9;Ip=[193.176.158.140];Helo=[mail.acquiretm.com]

How many variations on a customer ID does MS need?

> X-MS-Exchange-CrossTenant-AuthSource:
> CY4PEPF0000EE34.namprd05.prod.outlook.com

Definitely: CY4PEPF0000EE34 is some sort of Tenant/Source identifier.
Maybe helpful...

> X-MS-Exchange-CrossTenant-AuthAs: Anonymous

Really? I wonder how often that happens? I'm always interested in
anonymous auth (either 'auth')

> X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
> X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR20MB3698

And there's that correlating nonce again...

I don't know if any of those thoughts will give ideas for good actual
rules for you (or anyone) but they are what comes to mi9nd when I look
at those headers.

--
Bill Cole
bill@scconsult.com or billcole@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
Re: MS-relayed spam [ In reply to ]
I started forwarding full headers and text to "abuse@outlook.com" and they
blocked my IP.

-----Original Message-----
From: David Jones via users
Sent: Tuesday, January 2, 2024 1:07 PM
To: Charles Sprickman
Cc: SA Mailing list
Subject: Re: MS-relayed spam

I would report this to Microsoft Abuse and setup local rules that add a
point or two something like this:

header BAD_O365_SENDER X-OriginatorOrg =~ /.*\.onmicrosoft\.com$/

With a threshold of 6.2, you might want to consider either lowering that a
little or bumping up some default scores for some of the "worse" rules.

Most legit senders should not be using their onmicrosoft.com for their
primary address but there are a few that I have seen over the years so I
also have a counter rule to subtract a point or two for specific
onmicrosoft.com subdomains.

?On 1/1/24, 3:29 PM, "Charles Sprickman" <spork@bway.net
<mailto:spork@bway.net>> wrote:


EXTERNAL EMAIL: This message originated outside of ENA. Use caution when
clicking links, opening attachments, or complying with requests. Click the
"Phish Alert Report" button above the email, or contact MIS, regarding any
suspicious message.

Hi all,

Full headers are here as well: https://pastebin.com/wHNmnvtE
<https://pastebin.com/wHNmnvtE>

I'm not really following what's going on here - a few things confuse me...

- the empty from envelope, which I thought was more of a "bounce" thing
- that it does seem formatted like a bounce
- across multiple servers I'm seeing a ton more spam just like this the past
few weeks coming in via MS
- I had assumed that MS (or gmail, or any large provider) would be a bit
more tuned to this kind of abuse

Anyone else seeing this and if so, what mitigations are you doing in SA?

To me, it appears that a company with some kind of on-prem email server is
using MS' inbound/outbound filtering/relaying for their email, and I'm
assuming that the company (acquiretm dot com) has compromised account(s)
being used for spam, and that this type of account is valuable since it's
relayed through a somewhat "trusted" entity (MS). Stumped on the empty
envelope from though...

Thanks,
Charles

Full headers inline:


Return-Path: <MAILER-DAEMON>
Delivered-To: MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>
Received: from mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.2])
by mail.MYDOMAIN.COM (Postfix) with ESMTP id 62E4ACCE44
for <MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>>; Mon, 1 Jan 2024
14:23:33 -0500 (EST)
X-Virus-Scanned: amavisd-new at MYDOMAIN.COM
X-Spam-Flag: NO
X-Spam-Score: 3.971
X-Spam-Level: ***
X-Spam-Status: No, score=3.971 tagged_above=-100 required=6.2
tests=[.ARC_SIGNED=0.001, ARC_VALID=0.001, BAYES_00=-1.9,
DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,
FORGED_SPF_HELO=1, FREEMAIL_FROM=0.001, FROM_LOCAL_NOVOWEL=0.5,
HK_RANDOM_FROM=0.001, HTML_IMAGE_ONLY_24=1.618, HTML_MESSAGE=0.001,
MIME_HTML_ONLY=0.1, RCVD_IN_DNSWL_NONE=-0.0001,
RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_RPBL=1.31,
SCC_BODY_URI_ONLY=1.44, SPF_HELO_PASS=-0.001, T_REMOTE_IMAGE=0.01,
T_SCC_BODY_TEXT_LINE=-0.01] autolearn=no autolearn_force=no
Received: from mail.MYDOMAIN.COM ([207.99.1.2])
by mail.MYDOMAIN.COM (mail.MYDOMAIN.COM [207.99.1.]) (amavisd-new, port
10024)
with ESMTP id y8UwjrBjDDCO for <MYEMAIL@MYDOMAIN.COM
<mailto:MYEMAIL@MYDOMAIN.COM>>;
Mon, 1 Jan 2024 14:23:31 -0500 (EST)
Received: from NAM11-DM6-obe.outbound.protection.outlook.com
(mail-dm6nam11hn2245.outbound.protection.outlook.com [52.100.172.245])
(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by mail.MYDOMAIN.COM (Postfix) with ESMTPS id 731A6CCE43
for <MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>>; Mon, 1 Jan 2024
14:23:31 -0500 (EST)
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
b=Icl1NbdVBzy5nVKV4XGHyD5lhcUdtzirTQuOX40QfE0Qb4eogob5tBOWT7T7oxZ6O7oogwqarlyCmJXZfKwxDknw8W/1q9UzYGmNu0vt9l/C/TAQGHd2qdDo7k/S5rA/VkvSbwsWsPlPzHM5gpPvERtV1AwGRibQFb7IAJkW1bL6aTyG8R2JHPyDtSE5hG+0/XFuct7sSqoyr8J1hv7cOP6ZsOmlfLFuKxYoAEqFdi0qCsQD/CjfFzFNcaj9Sas09hbA1E/lEU5lf43EJFPOUX9ieGQA292aleu0PO2lqaU+TOwrr9UdnSHPyo89vQUHCiMd9+4ZMb51dxkvx6dLWQ==
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=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
b=gBRRLW2K0klYaRjOr+bNZO7zS3m+Kb+mkggilqYBqELoa12h3G5gwGFye+aLoJjtPSDnS1d0/GUkPYWm2/JlQZtoKmq4YAqwA4tnT2HYRcckobGDbhOcaop7wKmcQutiBxdr2iG8Hjmbvkf6jkP2AHL9kVqZv73Byv60sg1djmVaNHR+2qJd3vyQ3kepYsngd9QtdsyjjFBb+VjyItwaijKmjO4IBSIr4X5i5CmK+v67YoalMVjoXnKaMEpK/4Qh3Eh5zyzGHjdT7+QzK/T4cDSu+1XA+rHcK7G4/BTwLRs+NBTOYMT52Zr4eo5462nuo/ITG3+SjPM9g8QXkfJ06Q==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none (sender ip is
193.176.158.140) smtp.rcpttodomain=MYDOMAIN.COM
smtp.helo=mail.acquiretm.com;
dmarc=none action=none header.from=x1r862t.onmicrosoft.com; dkim=none
(message not signed); arc=none (0)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=x1r862t.onmicrosoft.com; s=selector1-x1r862t-onmicrosoft-com;
h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
bh=cMMl8FFbE2iyyDXVN5kGmj7djfYu1Ef14DADjnKqLVc=;
b=R1X4dpKSgryTH6OLmMzRy/tDWLnQEV8mHOEEtjH+lXKLhUWP1IcSU7ti48ZJoXOksGz7A4+ZbSb5s1wNp2A4dGS+psXMeDNERbCeNVeGFRy/0AfJX4BSO52imrh48OaXFvTjmcrwSondZQkeC2plLlatu2jWPXn+a48T+gCuUZtFOpy6+1OlQqtOhQd5Ork4w7yD6nIicaXcQ4GhpDX1YM6zU02EUOSl+pxEgJj5/WuHvXNbtuTmdsGid1JhRnmIyvR15jGzXHkyrD/KYHw3evZSOV8pJ8EMpUPDEiwdHjDGYt38j/Wwiho5yVfR/zNZa5wELOq9bYgLK0G91JywQA==
X-MS-Exchange-Authentication-Results: spf=none (sender IP is
193.176.158.140)
smtp.helo=mail.acquiretm.com; dkim=none (message not signed)
header.d=none;dmarc=none action=none header.from=x1r862t.onmicrosoft.com;
Date: Mon, 01 Jan 2024 20:19:49 +0100
Importance: high
Subject: Your iCloud Storage Is Full. Receive 50 GB for FREE
X-TOI-MSGID: <1660898088.4BDAB4AB9E89D.1704136789437@acquiretm.com
<mailto:1660898088.4BDAB4AB9E89D.1704136789437@acquiretm.com>>
In-Reply-To:
<952HtCJGcsDXt5hYdIx5kfocgsAN34o2GPHcYVpB6@egw.x1r862t.onmicrosoft.com
<mailto:952HtCJGcsDXt5hYdIx5kfocgsAN34o2GPHcYVpB6@egw.x1r862t.onmicrosoft.com>>
Content-Type: text/html; charset="UTF-8"
CC: MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>
To: MYEMAIL@MYDOMAIN.COM <mailto:MYEMAIL@MYDOMAIN.COM>
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Storage Notice <info_QwzrlPCPwPQ@x1r862t.onmicrosoft.com
<mailto:info_QwzrlPCPwPQ@x1r862t.onmicrosoft.com>>
Message-ID:
<0e3b3785-6682-4c22-b6d7-87286c342cd7@CY4PEPF0000EE34.namprd05.prod.outlook.com
<mailto:0e3b3785-6682-4c22-b6d7-87286c342cd7@CY4PEPF0000EE34.namprd05.prod.outlook.com>>
X-EOPAttributedMessage: 0
X-MS-PublicTrafficType: Email
X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE34:EE_|CO6PR20MB3698:EE_
X-MS-Office365-Filtering-Correlation-Id:
3b787f74-e97d-4744-853e-08dc0aff1ea0
X-MS-Exchange-SenderADCheck: 1
X-MS-Exchange-AntiSpam-Relay: 0
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info:


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
X-Forefront-Antispam-Report:
CIP:193.176.158.140;CTRY:FR;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.acquiretm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(136003)(346002)(376002)(396003)(39860400002)(230922051799003)(61400799012)(1690799017)(451199024)(7200799017)(64100799003)(82310400011)(46966006)(8400799017)(3082699003)(40480700001)(336012)(42882007)(26005)(41320700001)(31696002)(81166007)(558084003)(166002)(82740400003)(17440700003)(35950700001)(34020700004)(47076005)(4326008)(67280400001)(19625305002)(5660300002)(9686003)(8936002)(8676002)(70206006)(70586007)(786003)(78352004)(316002)(6916009)(42186006)(2906002)(41300700001)(498600001)(84603001)(42472002)(38122002);DIR:OUT;SFP:1501;
X-OriginatorOrg: x1r862t.onmicrosoft.com
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jan 2024 19:23:21.7479
(UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id:
3b787f74-e97d-4744-853e-08dc0aff1ea0
X-MS-Exchange-CrossTenant-Id: aae3bce2-b5e6-4c64-9336-2909094ee8c9
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp:
TenantId=aae3bce2-b5e6-4c64-9336-2909094ee8c9;Ip=[193.176.158.140];Helo=[mail.acquiretm.com]
X-MS-Exchange-CrossTenant-AuthSource:
CY4PEPF0000EE34.namprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR20MB3698
Re: MS-relayed spam [ In reply to ]
On Tue, Jan 2, 2024 at 3:11?PM Torpey List <list@torpey.org> wrote:

> I started forwarding full headers and text to "abuse@outlook.com" and
> they
> blocked my IP.
>
>
abuse@outlook.com is for reporting abuse on the freemail
Outlook/Hotmail/MSN platforms, not Microsoft tenants.

https://msrc.microsoft.com/report/
Re: MS-relayed spam [ In reply to ]
>On Tue, Jan 2, 2024 at 3:11?PM Torpey List <list@torpey.org> wrote:
>> I started forwarding full headers and text to "abuse@outlook.com" and
>> they blocked my IP.

On 02.01.24 16:49, Shawn Iverson wrote:
>abuse@outlook.com is for reporting abuse on the freemail
>Outlook/Hotmail/MSN platforms, not Microsoft tenants.

What?

If the message came from .outlook.com hosts, it should be reported to
abuse@outlook.com.

--
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
You have the right to remain silent. Anything you say will be misquoted,
then used against you.
Re: MS-relayed spam [ In reply to ]
On Wed, Jan 3, 2024 at 5:06?AM Matus UHLAR - fantomas <uhlar@fantomas.sk>
wrote:

> What?
>
> If the message came from .outlook.com hosts, it should be reported to
> abuse@outlook.com.
>
> You are right, it did come from an .outlook.com host. My mistake. I'm not
sure why they blocked the user, then.