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Unknown Email

Posted on 2013-11-29
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Last Modified: 2014-01-07
Hi,

A client of mine is receiving a lot of emails from unknown@domain.local to their exchange mailboxes

I have checked and the exchange/smtp server and it's not set to logging as per some of the forum i've seen.

Any other ideas?

thanks
Ryan
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Question by:ryank85
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Expert Comment

by:Simon Butler (Sembee)
ID: 39685183
What do the messages actually say? It could simply be a spamming run, or an application that is sending out lots of messages. Not really enough to go on.

If you look at the headers, does that show the source as being external?

Simon.
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Author Comment

by:ryank85
ID: 39685472
Hi Simon

The emails are blank, we can only see where the email has come from:-

These are the message headers.

Received: from domain.local (192.168.0.2) by SERVER.domain.local
 (192.168.0.2) with Microsoft SMTP Server id 8.3.298.1; Fri, 29 Nov 2013
 02:23:35 +0000
From: "Unknown@domain.local" <Unknown@domain.local>
Date: Fri, 29 Nov 2013 02:23:35 +0000
Subject:
Thread-Index: Ac7sqgG5VWOy/XkhRPenYqPNlMkRjQ==
Message-ID: <9b85a112-a7cf-415f-afe9-0ff6238f5fd6@Server.domain.local>
X-MS-Exchange-Organization-AuthAs: Internal
X-MS-Exchange-Organization-AuthMechanism: 0a
X-MS-Exchange-Organization-AuthSource: Server.domain.local
X-MS-Has-Attach:
X-Auto-Response-Suppress: DR, OOF, AutoReply
X-MS-TNEF-Correlator:
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
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LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39685798
That is coming off something internal.
How much of that header have you changed? Does it really say unknown? Does the second part match your internal domain, or is it really domain.local?

While I appreciate that you want to hide information, in this case it is actually making it hard to diagnose without knowing what is genuine and what has been changed.

For example, some APC software has @domain.local in there as default.

Simon.
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Author Comment

by:ryank85
ID: 39689335
Hi Simon

The only thing that has been changed in the header is the 'domain' the actual name of the domain is the clients name. e.g clientname.local

thanks
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Accepted Solution

by:
Simon Butler (Sembee) earned 500 total points
ID: 39692667
Something internal is doing it. I cannot really help you much more than that.
Could be a printer, scanner, script, something like that.
There isn't enough in the header to diagnose the source.

Simon.
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Author Comment

by:ryank85
ID: 39697589
ok thanks for your help
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Author Closing Comment

by:ryank85
ID: 39761712
no more emails received on this matter
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