How to force Outlook's Junk email fitler to not filter Exchange 2010 SP1 accepted domains?

Question

Hello,
I wonder if there really is no way how to reach the result described in the title question. Because
http://support.microsoft.com/kb/2458522 says:
This issue occurs because of a functionality change that is introduced in Exchange Server 2010 SP1. In Exchange Server 2010 SP1, domains that are configured as accepted domains are no longer allowed in the junk email lists of a mailbox.
So please tell us Microsoft how can we force Outlook to accept internal domain as a trusted senders and not apply Junk email filter on it?
There was already a long discussion about the steps here
http://social.technet.microsoft.com/Forums/en-US/outlook/thread/15f857c6-0ed4-4004-9d90-cb5d16361752 so please don't offer anything described there.
Thank you,

Answer 1

Trying to deal with the Outlook Junk Email Filter is not very easy and had been a pain in the butt.
The ONLY way to ensure the Outlook 2010 Junk Email filter honors "white listed" emails is to stamp the email with SCL -1. Setting a transport rule will do that but it is not very flexible. 
I was able to resolve these issues by simply enabling the Exchange 2010 Anti-Spam agents on each hub transport server. We have no Edge Server but we use a couple of Ironports at the gateway which provide the bulk of AntiSpam. We didn't think we would
need the Exchange AntiSpam so we hadn't initially enabled. After months of trying to resolve people's complaints of emails from internal system ending up in Junk, this solution worked for us.
This is the order in which it was done.
1. We set the receive connectors for the internal systems for bypassing Anti Spam. We basically have 2 receive connectors, one for internal system with no relay, and one for internal systems who are allowed external relay.
Get-ReceiveConnector "server\name of the recieve connector" | Add-ADPermission -User "“NT Authority\Anonymous Logon”  -AccessRights ExtendedRight
-ExtendedRights ms-exch-bypass-anti-spam
Note: If you use SMTP Authentication, Exchange will only mark the emails as "Internal" and not assign a SCL of -1. It can only be on anonymous connections.
Note: We have a separate receive connector for the Ironports delivering external email that will not bypass Anti-Spam. These emails will receive a SCL rating of 0-9
2. We set the global SCL to 6 (default is 4). You can set it to whatever you want.
Set-OrganizationConfig -SCLJunkThreshold 6
So basically, any email tagged with SCL 7-9 will be moved to Junk by Exchange.
3. Set-ContentFilterConfig -SCLQuarantineEnabled $False -SCLDeleteEnabled $False -SCLRejectEnabled $False
We don't want delete, reject or quarantine anything on Exchange. Just move email to Junk folder if SCL 7-9 and have user deal with it.
4. Set the Internal SMTP Servers by adding each Exchange server's IP Address to the Global Transport Settings. I used EMC, Organization Config, Global Settings, Transport Settings properties, Message Delivery tab. Do NOT add any other "internal" servers
here, only the Exchange servers.
5. Then we installed the AS agents on each HT Server.
Starting with the first server
Stop MSExchange Transport service
D:\Program Files\Microsoft\Exchange Server\V14\Scripts>.\install-AntispamAgents.ps1
After installation, disable all the agents except for Content Filtering Agent. This agent has to be enabled for Exchange to stamp the email with SCL -1. I used EMC, Organization Config, Hub Transport. You will see a new tab called Anti-Spam. Disable everything
except Content Filtering.
Start MSExchange Transport service.
Repeat on each HT server. (You won't have to repeat the disabling of the agents as that is a global setting)
6. You can add global safe senders by doing the following.
$list = (Get-ContentFilterConfig).BypassedSenders
$list
$list.add("[email protected]")
$list.add("[email protected]")
Set-ContentFilterConfig -BypassedSenders $list
The message headers are stamped with
For emails sent through the Internal connector
X-MS-Exchange-Organization-Antispam-Report: MessageSecurityAntispamBypass
X-MS-Exchange-Organization-SCL: -1
OR
For external emails from a safe sender
X-MS-Exchange-Organization-Antispam-Report: ContentFilterConfigBypassedSender
X-MS-Exchange-Organization-SCL: -1
OR
For all other external emails
X-MS-Exchange-Organization-SCL: 0
Good Luck. This has basically stopped all the calls about "legitimate" email in Junk Email folder.