Solved

Exchange 2010 SCL Filtering with Internal SMTP Smart Host

Posted on 2014-09-09
4
331 Views
Last Modified: 2014-09-12
I have an SBS 2011 server running Exchange 2010 that utilizes an SMTP smart host that receives all inbound email which then forwards to the Exchange server.  What I have noticed is that none of the content filtering I have enabled on the Exchange server is working and applying SCL ratings because the smart host is internal and on the same domain.  After researching this scenario it seems that Exchange by default will not filter any internal email.  I would like to change this and allow Exchange to apply an SCL rating on inbound mail that it receives from the smart host.  What would be the proper configuration to achieve this and force Exchange to apply the SCL content filtering?  

Any information is appreciated.  

Thank you
0
Comment
Question by:ColumbiaMarketing
  • 2
  • 2
4 Comments
 
LVL 63

Accepted Solution

by:
Simon Butler (Sembee) earned 500 total points
Comment Utility
If you have a smart host accepting email from the internet, that is really where the spam filtering should be taking place. Trying to do it at Exchange is much too late.

To answer your specific question, you cannot change the behaviour of Exchange. Exchange is expecting to either be the primary receiver of the email, or a host to be in a DMZ, so a separate IP address range.

Simon.
0
 

Author Comment

by:ColumbiaMarketing
Comment Utility
Thank you for the information.  I should clarify my goal with this.  There is a small amount of spam that will make it through the smart host and since Exchange is not rating any emails from it the spam will be put directly into the Inbox folder.  Ideally, if Exchange could tag messages from the smart host with an SCL rating I could then mitigate this by filtering potential spam into the Junk E-Mail folder rather than the Inbox within Outlook.  Or is this method not the best practice?  I would like to handle this from the Exchange server itself rather than configuring Outlook's own spam filtering on a per user basis to filter potential spam to the Junk E-mail folder.  

Maybe configuring a GPO for Outlook spam filtering to be more aggressive would be a better way to handle this from the server.
0
 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
Comment Utility
Thinking about it again  - it should be working as you have outlined, as there are loads of posts on this site about IMF catching messages from scanners etc. If you look at one of the messages, does it have any SCL value? Maybe the message that is getting through wouldn't be blocked by Exchange either.

Simon.
0
 

Author Comment

by:ColumbiaMarketing
Comment Utility
Yes, by default it will tag the messages with a -1 SCL rating, which is basically the equivalent of white listing.  After checking with an engineer at Microsoft it seems that this is by-design and can not be changed for internal email.  So handling this from the server side really isn't practical in my case.  Although the option of increasing the spam threshold in Outlook would be an alternative.  

Your notion of handling all filtering at the smart host would be correct in my situation as this is the way Exchange is designed to run when utilizing a smart host on the same internal network.    

Thank you for your help.
0

Featured Post

Do email signature updates give you a headache?

Do you feel like you are constantly making changes to email signatures? Are the images not formatting how you want them to? Want high-quality HTML signatures on all devices, including on mobiles and Macs? Then, let Exclaimer solve all your email signature problems today.

Join & Write a Comment

Easy CSR creation in Exchange 2007,2010 and 2013
Following basic email etiquette rules will help you write a professional email and achieve a good, lasting impression with your contacts.
In this video we show how to create a Contact in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >> Contact ta…
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates‚Ķ

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now