Hey Guys
We're having some trouble with phishing mails. The mails are looking like they are coming from one of our domains. This is the header (I censored some values):
Received: from MX01.ourdomain.ch (192.168.110.19) by MX01.ourdomain.ch
(192.168.110.19) with Microsoft SMTP Server (TLS) id 15.0.1293.2 via Mailbox
Transport; Thu, 27 Jul 2017 07:09:52 +0200
Received: from MX01.ourdomain.ch (192.168.110.19) by MX01.ourdomain.ch
(192.168.110.19) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Thu, 27 Jul
2017 07:09:52 +0200
Received: from utm.ourdomain.net (8.8.8.8) by MX01.ourdomain.ch
(192.168.110.19) with Microsoft SMTP Server (TLS) id 15.0.1293.2 via Frontend
Transport; Thu, 27 Jul 2017 07:09:52 +0200
Received: from p3plsmtp06-06-2.prod.phx3.secureserver.net ([97.74.135.61]:32798 helo=p3plwbeout06-06.prod.phx3.secureserver.net)
by utm.ourdomain.net with esmtps (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256)
(Exim 4.82_1-5b7a7c0-XX)
(envelope-from <coyltm@outsourcedparalegalservices.com>)
id 1dab3W-0004Vb-0A
for hansueli.wuerth@ourdomain.ch; Thu, 27 Jul 2017 07:09:50 +0200
Received: from localhost ([97.74.135.16])
by :WBEOUT: with SMTP
id aavrdkJp5RW0maavrdbZZo; Wed, 26 Jul 2017 22:01:55 -0700
Received: (qmail 9835 invoked by uid 99); 27 Jul 2017 05:01:55 -0000
From: Hans Peter <hans.peter@ourdomain.ch>
To: <hansueli.steck@ourdomain.ch>
Subject: =?utf-8?B?U0VQQS9BdXNsYW5kc8O8YmVyd2Vpc3VuZw==?=
Thread-Topic: =?utf-8?B?U0VQQS9BdXNsYW5kc8O8YmVyd2Vpc3VuZw==?=
Thread-Index: AQHTBpaUIJao8jCRdkCqU8pTtJMqZA==
Date: Thu, 27 Jul 2017 05:01:53 +0000
Message-ID: <20170726220153.291ba9ef5338a76a8a2301db4d3f8952.c0649b8c8a.wbe@email06.godaddy.com>
Reply-To: Hans Peter <mykcome@gmail.com>
Content-Language: de-CH
X-MS-Exchange-Organization-AuthSource: MX01.ourdomain.ch
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: 50.63.197.83
user-agent: Workspace Webmail 6.8.5
x-sender: coyltm@outsourcedparalegalservices.com
Content-Type: multipart/alternative;
boundary="_000_20170726220153291ba9ef5338a76a8a2301db4d3f8952c0649b8c8_"
MIME-Version: 1.0
Now, our UTM shows coyltm@outsourcedparalegalservices.com as the sender, outlook shows hans.peter@ourdomain.ch. The sender asks for some payments and if the user answers, the mail goes to mykcome@gmail.com, as you can see in the header.
It's clear why the spf check doesn't work in this case, but any idea how we can filter this kind of mails?
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