Question

SPAM on mobile phones when Outlook is not open - Exchange 2007, 2003

Asked by: computerwrangler

I have been getting requests lately to better manage all the spam that is being delivered to my client's mobile phones. What happens is ALL the junk mail that is delivered into the Junk folder in Outlook (the spam filtering works quite well using IMF in Exchange) get delivered to the mobile phone's inbox as a new message. As you can imagine, this is quite frustrating when your phone is buzzing every 10 mins with a new spam message.

My question is, how can I preven the spam from being delivered to the mobile phones? Always keeping Outlook open is not an option, most users have laptops anyway.

Using Microsoft Windows Small Business Server 2008, Exchange 2007
No third-party anti-spam software being used.
Mobile phones being used are Blackberry, Windows Mobile 6, some Sprint Samsung proprietary phones.

I did reference this previous post:
http://tinyurl.com/m6ngqf

but that is really of no help. Thanks!

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Asked On
2009-06-01 at 08:07:05ID24453553
Tags

Microsoft Exchange

,

Spam

,

IMF

,

Mobile Phone

Topics

Exchange Email Server

,

Windows Mobile (Pocket PC / Win CE) Operating Systems

,

Cellular Phones & Carriers

Participating Experts
3
Points
500
Comments
5

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Answers

 

by: upul007Posted on 2009-06-01 at 08:16:38ID: 24518320

Have you enabled RDNS checking on the Exchange box as well as SPF checking? This should reduce the sheer volume of spoofed email coming in to the server.

RDNS - http://www.amset.info/exchange/dnsconfig.asp

SPF - http://www.msexchange.org/tutorials/Configuring-enabling-Sender-ID-filtering-Exchange-2003-SP2.html

http://social.microsoft.com/Forums/en-US/windowsmobileactivesync/thread/fb194163-94ca-4fa8-89fa-041c313c6077 and other sites indicate that a server side solution is needed here

 

by: computerwranglerPosted on 2009-06-01 at 08:35:59ID: 24518597

I have setup RDNS and SPF, configured IP Blocklists to update via SpamHaus.org. Spam still comes in, its not THAT much spam (seems to affect certain users much more than others) but the problem is its delivered to the mobile phones, the Samsung in particular.

We were able to eliminate most of the spoofed spam messages that looked like they come from yourself by enabling the Sender ID filtering.

Would a third-part solution, such as SpamFighter (we use that in a couple other organizations) help this?

 

by: MesthaPosted on 2009-06-01 at 08:39:09ID: 24518655

The only way to deal with this is to have the spam dealt with before it hits Exchange. The problem is due to where ActiveSync picks up the messages. ActiveSync isn't alone in having this problem, Blackberry suffers as well, but RIM put something in to BES which allows you to slow it down.

Simon.

 

by: upul007Posted on 2009-06-01 at 08:40:21ID: 24518672

The answer should already be with you. How does the mobile users at these sites compare on spam received?

if the spam filter is before the exchange box, it will definitely help, if it is better at filtering spam. Bad news is that, someone may need to go through the spam now and then.

 

by: jspazianoPosted on 2009-06-01 at 18:07:01ID: 24523254

If you put a spam filter before exchange that tags the subject with [SPAM] or something along those lines then set up a server side rule to move anything with [SPAM] in the subject to the junk e-mail folder that will take care of it.

if you're looking to do it on the cheap i've found that untangle is excellent.
www.untangle.com .. i've been using this for over a year now and it works great.

no spam filtering solution is fool proof though, users will still want to review junk on a regular basis.
personally i have found that untangle catches more spam and has less false postives than commerical solutions like GFI mailessentials.

20120131-EE-VQP-002

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