Question

How to stop spoof emails

Asked by: GuildOfDruids

Hi Everyone,

Our employees get  Spam from other colleagues, and sometimes from their@emailaddress to their@emailaddress.

- We have Exchange Server 2003 with Upto date Antivirus & Firewall.
- GFI MailEssentails
- SPF Record for the domain  "v=spf1 mx a:mail.mydomain.co.uk -all"
- NOT open relay as checked "550 5.7.1 Unable to relay for test1@checkor.com"

But still receiving these emails. what else do we have to check.

I have attached the spam email's header and a snapshot for reference.

Thanks in advance. 

Microsoft Mail Internet Headers Version 2.0
Received: from 201-1-171-38.dsl.telesp.net.br ([201.1.171.38]) by mail.mydomain.co.uk with Microsoft SMTPSVC(6.0.3790.3959);
	 Thu, 5 Nov 2009 09:31:06 +0000
Received: from 201.1.171.38 by mydomain.co.uk; Thu, 5 Nov 2009 07:29:23 -0300
Message-ID: <000d01ca5dfa$76050c90$6400a8c0@throttlesx>
From:<admin@mydomain.co.uk>
To: <admin@mydomain.co.uk>
Subject: Please read my friend
Date: Thu, 5 Nov 2009 07:29:23 -0300
MIME-Version: 1.0
Content-Type: multipart/alternative;
	boundary="----=_NextPart_000_0007_01CA5DFA.76050C90"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.3790.2663
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2663
Return-Path: throttlesx@intesolv.com
X-OriginalArrivalTime: 05 Nov 2009 09:31:07.0208 (UTC) FILETIME=[B3BB3C80:01CA5DFA]
                                  
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Asked On
2009-11-05 at 02:12:29ID24873842
Tags

spoof email from me to me

Topics

Anti-Spam Email Software

,

Exchange Email Server

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Email Servers

Participating Experts
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Points
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Comments
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Answers

 

by: shauncroucherPosted on 2009-11-05 at 02:22:08ID: 25748073

Block your own domain in Sender Filtering in Exchange.

Shaun

 

by: GuildOfDruidsPosted on 2009-11-05 at 02:31:05ID: 25748117

Yes but one of our employee is using pop from outside, so sometimes he send email to other employees. So this will block him to send emails to others in same organization.


 

by: RatBoy1Posted on 2009-11-05 at 02:37:19ID: 25748154

have you got a spam filter ?

 

by: GuildOfDruidsPosted on 2009-11-05 at 02:39:00ID: 25748163

Yes -  GFI MailEssentails

 

by: RatBoy1Posted on 2009-11-05 at 02:50:04ID: 25748207

To stop people sending email as other people.
You can remove the "from" field / option for users via the link below:
http://www.petri.co.il/forums/showthread.php?t=30921

Then any users spaming you can blacklist or provide warnings to as they should not be doing this in the first place.

 

by: GuildOfDruidsPosted on 2009-11-05 at 03:14:25ID: 25748321

I think that's a different issue, they don't send spam to each other it's spammers from outside spoofing their email addresses.

 

by: alanhardistyPosted on 2009-11-05 at 03:51:02ID: 25748511

Does your domain have an SPF record setup?

http://www.mxtoolbox.com/spf.aspx

If not - please set one up, then assuming you are using Exchange 2003 with Service Pack 2 installed, adjust your Intelligent Message Filtering settings to use Sender Filtering and add *@yourdomain.com as the sender which will block all messages from people pretending to be from your domain.

Also setup SPF checking in Intelligent messgae filtering and reject those that fail.

If you have any users who work externally to your server using SMTP / POP3, then the above won't work.  Better to get HTTP over RPC for those users and then the above will work.  If you cannot setup HTTP over RPC, then add individual users to the sender filter instead of *@yourdomain.com.

http://www.msexchange.org/tutorials/Sender-Recipient-Filtering.html

 

by: alanhardistyPosted on 2009-11-05 at 03:52:16ID: 25748519

 

by: alanhardistyPosted on 2009-11-05 at 03:53:28ID: 25748527

 

by: shauncroucherPosted on 2009-11-05 at 04:05:36ID: 25748593

Shame you are using POP still, you have an SPF record setup for your domain, so are you using SenderID on your server to check inbound mail and associated domain SPF?

Otherwise, make sure your AntiSpam product is up to date and functioning properly, does the  content in the message look suspect, why is it not being detected by GFI?

Shaun

 

by: alanhardistyPosted on 2009-11-05 at 04:09:41ID: 25748614

Shaun - I think you read my comment and picked up POP3.  Mine was the first mention of this and was a comment in case they were using it ;-)

 

by: shauncroucherPosted on 2009-11-05 at 04:20:41ID: 25748665

@alanhardisty, Sorry, I didn't see your comments, I was replying to comment 25748117 from the author, but I hadn't refreshed my screen for a while and so didn't see all the other comments made!

Cheers

Shaun

 

by: alanhardistyPosted on 2009-11-05 at 04:21:53ID: 25748675

Ah - yes - well spotted - I missed that one!

 

by: GuildOfDruidsPosted on 2009-11-05 at 05:08:02ID: 25748974

@alanhardisty

I had setup OWA for the remote employee but he wasn't happy with it, so I had to re-setup POP3.

It's a huge list of users so it will be alot harder for me to put individual entries.

 

by: alanhardistyPosted on 2009-11-05 at 05:14:07ID: 25749021

Sure - understand.  In that case HTTP over RPC is a great option for you.  Simple enough to setup and then you can add *@yourdomain.com to the filter.

Link to how to set it up: http://www.amset.info/exchange/rpc-http.asp

Alternatively, can I recommend a trial of Vamsoft ORF - www.vamsoft.com.  Priced at $239 per server - probably cheaper than you are paying now for GFI Mail Essentials and it has obliterated my spam from 5-6 a week to 6 in 2 months.

 

by: xfreddiePosted on 2009-11-05 at 06:34:39ID: 25749821

Best solution is to use RPC over HTTP, like alanhardisty suggested.
That way every one in your company will use the company mailserver to email.

And then all you need to do is to configure a SPF record for your domain(s)

Regards,
xfreddie

20120131-EE-VQP-002

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