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Query on Outlook Junk Mail

Posted on 2009-06-30
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Last Modified: 2013-12-09
Hi

We are using Exchange 2003 SP2 and Outlook 2003/2007 clients. We have IMF enabled and running on the Exchange gateways that connect with our 3rd party SMTP relays. We are running a multi-domain AD forest and one Exchange org.

One of our departments wants to send some mails to a number of internal users and we want to ensure these don't get caught in the Outlook Junk Mail.

Could someone just confirm that it's not possible for internally originated mail (i.e messages sent from within the same Exchange org) to be classed as Junk? Or is it?

If so, is there any way to 'whitelist' our mail domain?

Also, does any of this behaviour change with Exchange 2007?

Many thanks!
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Question by:bruce_77
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Mestha earned 2000 total points
ID: 24750504
Depends how the messages are delivered.
If they are delivered from a MAPI client (ie Outlook) then they get an SCL of -1 and are not blocked.
If they are delivered by SMTP then they are subject to IMF filtering.

If the messages are being delivered to the server by SMTP then the easiest way to deal with this is to simply create a second internal only SMTP filter that doesn't have IMF filtering enabled.

While it is possible to set a global white list for Outlook, it is a replacement for what is there. So if you white list your own domain users will be unable to add their own to the list.

Simon.
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by:bruce_77
ID: 24752566
Hi Simon

Thanks, so basically if the messages are sent using a programme that uses MAPI (e.g. Mail Merge), there shouldn't be no problem..however, if they are using an application server then the mails would have to be routed via the IMF servers still and they will be filtered as per policy?

You say mails from MAPI have an SCL of -1: Is this because they avoid the servers with the IMF filters on them, or IMF knows that MAPI originated mail is safe and therefore assigns a -1 mark?
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by:Mestha
ID: 24757156
If someone is in a position to send spam via MAPI then you have bigger problems to worry about. Therefore as long as it using Outlook or a MAPI interface (like a Blackberry server does) then it shouldn't be a problem. MAPI are internal emails, so IMF knows they are safe. Although I may be thinking of Exchange 2007 IMF which does the -1, I think on Exchange 2003 they don't go near the IMF system.

Simon.
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