X-Sender phishing

KatyComputer

Well-Known Member
Sep 26, 2019
193
16
58
61
St Louis
katycomputer.com
What is the best way to block phishers from using the X-Sender header to send Phish like this:
Received: from DM5PR06CA0096.namprd06.prod.outlook.com (2603:10b6:3:4::34) by
BY5PR19MB3972.namprd19.prod.outlook.com (2603:10b6:a03:225::21) with
Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5395.21; Tue, 5 Jul
2022 19:34:30 +0000
Received: from DM6NAM12FT068.eop-nam12.prod.protection.outlook.com
(2603:10b6:3:4:cafe::44) by DM5PR06CA0096.outlook.office365.com
(2603:10b6:3:4::34) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5395.14 via Frontend
Transport; Tue, 5 Jul 2022 19:34:29 +0000
Authentication-Results: spf=neutral (sender IP is 22.33.444.55)
smtp.mailfrom=chipbras.com.br; dkim=none (message not signed)
header.d=none;dmarc=none action=none header.from=client.com;
Received-SPF: Neutral (protection.outlook.com: 22.33.444.55 is neither
permitted nor denied by domain of chipbras.com.br)
Received: from mx.filter.com (22.33.444.55) by
DM6NAM12FT068.mail.protection.outlook.com (10.13.179.117) with Microsoft SMTP
Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
15.20.5417.8 via Frontend Transport; Tue, 5 Jul 2022 19:34:29 +0000
Received: from mx.filter.com (localhost [127.0.0.1])
by mx.filter.com (KatyComputer) with ESMTP id 00EFCC07B9
for lboss@client.com; Tue, 5 Jul 2022 14:34:29 -0500 (CDT)
Received-SPF: pass (chipbras.com.br: Sender is authorized to use 'chipbras@chipbras.com.br' in 'mfrom' identity (mechanism 'include:secureserver.net' matched)) receiver=mx.filter.com; identity=mailfrom; envelope-from=chipbras@chipbras.com.br; helo=p3plwbeout25-01.prod.phx3.secureserver.net; client-ip=216.69.139.12
Received: from p3plwbeout25-01.prod.phx3.secureserver.net (p3plsmtp25-01-2.prod.phx3.secureserver.net [216.69.139.12])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by mx.filter.com (KatyComputer) with ESMTPS
for lboss@client.com; Tue, 5 Jul 2022 14:34:26 -0500 (CDT)
Received: from p3plgemwbe25-03.prod.phx3.secureserver.net ([10.36.152.34])
by :WBEOUT: with SMTP
id 8oJQowIQchkmo8oJQoiMXJ; Tue, 05 Jul 2022 12:34:20 -0700
X-CMAE-Analysis: v=2.4 cv=WYHJ12tX c=1 sm=1 tr=0 ts=62c4923c
a=2BmizzOixHkOQSa6aDF9PA==:117 a=B4datkHeJT0A:10 a=CNGHLwnOuukA:10
a=nBd7tzB_5mkA:10 a=IkcTkHD0fZMA:10 a=RgO8CyIxsXoA:10 a=x7bEGLp0ZPQA:10
a=g42dPBg8OnHSrJkFxioA:9 a=_W_S_7VecoQA:10 a=QEXdDO2ut3YA:10
X-SECURESERVER-ACCT: chipbras@chipbras.com.br
X-SID: 8oJQowIQchkmo
Received: (qmail 32688 invoked by uid 99); 5 Jul 2022 19:34:20 -0000
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="utf-8"
X-Originating-IP: 97.85.142.17
User-Agent: Workspace Webmail 6.12.10
Message-Id: 20220705123418.82b9d9205b95e5aebb385723534cd9dd.6985285278.wbe@email25.godaddy.com
From: "HEATHER staff" hstaff@client.com
X-Sender: chipbras@chipbras.com.br
Reply-To: "HEATHER staff" DiirectDepositOfficeu@mail.com

To: lboss@client.com lboss@client.com
Subject: My Direct Deposit Update
 
A couple ideas - not sure how to implement or if they are a good idea:
  • Block X-Sender if X-Sender domain isn't on an allow list
  • Pre-pend the "X-Sender" to the message body or subject line
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!