Re: OT: Can IMF be tweaked

Hi Gary,

Thank you for your quick update.

Let's clarify this issue: We cannot use the IMF to deny messages from
specific domains, but we can use the sender filtering to achieve this goal,
if we are using the SMTP service for incoming emails (Incoming emails are
delivered to the Exchange Server directly, not use the POP3 Connector to
retrieve incoming emails). To do so, please perform the following steps:

To enable sender filtering

1. Open the Exchange System Manager, expand Global Settings, right-click
Message Delivery, click Sender Filtering tab.

2. On the Sender Filtering tab of the Message Delivery Properties dialog
box (see the following figure), click Add to add the SMTP address of a user
or a particular domain from whom you want to block messages.

You can block an individual sender, a whole domain, or a display name by
entering the display name in quotes.

3. To have Exchange save any messages that sender filtering blocks to an
archive folder (instead of automatically deleting these filtered messages),
select Archive filtered messages.

The archive folder is in the <drive>: \Program Files\Exchsrvr\Mailroot\vsi
n\archivefolder, where n is the virtual server instance of the SMTP virtual
server where sender filtering is enabled.

4. To block messages with a blank sender address (a technique that some
senders of unsolicited commercial e-mail messages use), select Filter
messages with blank sender.

5. To end the SMTP session when a sender matches an address on the
sender filter, select Drop connection if address matches filter.

6. To accept messages from senders on the block list without sending
notification to the sender that mail was not delivered, select Accept
messages without notifying sender of filtering.

7. Although you configure SMTP message filtering options in the Message
Delivery Properties dialog box, you must enable the filtering options on
the individual SMTP virtual servers where you want to apply the filtering.
Exchange applies these filters during the SMTP session when a remote SMTP
server connects to the SMTP virtual server.

A. On the Exchange System Manager, expand Servers -> DomainName ->
Protocols -> SMTP, right-click Default SMTP Virtual Server and select
Properties.

B. Click General tab, click Advanced button, highlight the IP Address
(All Unassigned) entry, and click Edit.

C. Check 'Apply Sender Filter' check box, and then click OK.

More information:

Configuring Sender Filtering
http://www.microsoft.com/technet/prodtechnol/exchange/guides/E2k3AdminGuide/
9e3759cd-a9ca-448a-a56a-240e8a02e674.mspx

I appreciate your time and cooperation. If anything is unclear, please feel
free to let me know. I am looking forward to hearing from you.

Best regards,

Nathan Liu (MSFT)
Microsoft CSS Online Newsgroup Support

Get Secure! - www.microsoft.com/security
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--------------------
>From: "Gary Karasik" <gkarasik@xxxxxxx>
>References: <#rItr7WvFHA.3960@xxxxxxxxxxxxxxxxxxxx>
<JGCwNDZvFHA.580@xxxxxxxxxxxxxxxxxxxxx>
>Subject: Re: OT: Can IMF be tweaked
>Date: Mon, 19 Sep 2005 21:37:35 -0700
>Lines: 137
>X-Priority: 3
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>X-Newsreader: Microsoft Outlook Express 6.00.2900.2670
>X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670
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>Newsgroups: microsoft.public.windows.server.sbs
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>Xref: TK2MSFTNGXA01.phx.gbl microsoft.public.windows.server.sbs:154688
>X-Tomcat-NG: microsoft.public.windows.server.sbs
>
>Thank you Nathan. Do you know if there are any plans to add this feature?
>
>> However, to allow messages from
>> specific domains, we can block messages sent by specific senders by using
>> sender filtering. This approach is useful if you receive unsolicited
>> commercial e-mail from particular domains or sender addresses.
>
>This is confusing. I can allow messages by filtering them?
>
>GaryK
>
>""Nathan Liu [MSFT]"" <v-natliu@xxxxxxxxxxxxxxxxxxxx> wrote in message
>news:JGCwNDZvFHA.580@xxxxxxxxxxxxxxxxxxxxxxxx
>> Hello Gary,
>>
>> Thank you for posting in the SBS newsgroup.
>>
>> According to your description, I understand that you would like to
>> configure the Intelligent Message Filter (IMF) to allow messages from
>> specific domains. If I have misunderstood the problem, please don't
>> hesitate to let me know.
>>
>> First of all, can I assume you use the SMTP service for incoming emails?
>> If
>> not, please note that IMF works on the SMTP virtual server. If you are
>> using POP3 connector to retrieve mails from ISP mailboxes, it's expected
>> that the messages will not get scanned by the IMF. This is because the
>> gateway level IMF only scans e-mails at SMTP incoming traffic. Since the
>> POP3 connector downloads the messages by using POP3 protocol and then
uses
>> CDO to directly deliver them to the recipients, the IMF will never catch
>> the messages. In addition, POP3 connector also does not work with the
>> Exchange built-in filters (Recipient Filtering, Sender Filtering and
>> Connection Filtering).
>>
>> For the question: Can Intelligent Message Filter be tweaked to allow
>> messages from specific domains?
>> Answer: Unfortunately, the Intelligent Message Filter cannot be tweaked
to
>> allow messages from specific domains. However, to allow messages from
>> specific domains, we can block messages sent by specific senders by using
>> sender filtering. This approach is useful if you receive unsolicited
>> commercial e-mail from particular domains or sender addresses.
>>
>> How to Enable Sender Filtering
>>
http://www.microsoft.com/technet/prodtechnol/exchange/guides/E2k3AdminGuide/
>> 6ec10d6d-faca-4279-b1db-aeb8328c4eb9.mspx
>>
>> Additionally, please refer to the following information: How Intelligent
>> Message Filter Works
>>
>> When an external user sends e-mail messages to an Exchange server with
>> Intelligent Message Filter installed, Intelligent Message Filter
evaluates
>> the textual content of the messages and assigns the message a rating
based
>> on the probability that the message is UCE. This rating is stored as a
>> message property called a spam confidence level (SCL) rating with the
>> message itself. This rating is persisted with the message when the
message
>> is sent to other Exchange servers.
>>
>> An administrator sets two thresholds that determine how Intelligent
>> Message
>> Filter handles e-mail messages with various SCL ratings: a gateway
>> threshold with an associated action to take on messages above this
>> threshold, and a mailbox store threshold. If a message has a rating
higher
>> than the gateway threshold, Intelligent Message Filter takes the action
>> specified. If the message has a rating below the gateway threshold, the
>> message is sent to the Exchange mailbox store of the recipient. At the
>> Exchange mailbox store, if the message has a higher rating than the
>> mailbox
>> store threshold, the mailbox store delivers the message to the user's
Junk
>> E-mail folder rather than to the Inbox.
>>
>> I appreciate your time and cooperation. If anything is unclear, please
>> feel
>> free to let me know. I am looking forward to hearing from you.
>>
>> Best regards,
>>
>> Nathan Liu (MSFT)
>> Microsoft CSS Online Newsgroup Support
>>
>> Get Secure! - www.microsoft.com/security
>> ======================================================
>> This newsgroup only focuses on SBS technical issues. If you have issues
>> regarding other Microsoft products, you'd better post in the
corresponding
>> newsgroups so that they can be resolved in an efficient and timely
manner.
>> You can locate the newsgroup here:
>> http://www.microsoft.com/communities/newsgroups/en-us/default.aspx
>>
>> When opening a new thread via the web interface, we recommend you check
>> the
>> "Notify me of replies" box to receive e-mail notifications when there are
>> any updates in your thread. When responding to posts via your newsreader,
>> please "Reply to Group" so that others may learn and benefit from your
>> issue.
>>
>> Microsoft engineers can only focus on one issue per thread. Although we
>> provide other information for your reference, we recommend you post
>> different incidents in different threads to keep the thread clean. In
>> doing
>> so, it will ensure your issues are resolved in a timely manner.
>>
>> For urgent issues, you may want to contact Microsoft CSS directly. Please
>> check http://support.microsoft.com for regional support phone numbers.
>>
>> Any input or comments in this thread are highly appreciated.
>> ======================================================
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>> --------------------
>>>From: "Gary Karasik" <gkarasik@xxxxxxx>
>>>Subject: OT: Can IMF be tweaked
>>>Date: Mon, 19 Sep 2005 16:07:33 -0700
>>>Lines: 8
>>>X-Priority: 3
>>>X-MSMail-Priority: Normal
>>>X-Newsreader: Microsoft Outlook Express 6.00.2900.2670
>>>X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670
>>>X-RFC2646: Format=Flowed; Original
>>>Message-ID: <#rItr7WvFHA.3960@xxxxxxxxxxxxxxxxxxxx>
>>>Newsgroups: microsoft.public.windows.server.sbs
>>>NNTP-Posting-Host: 216.115.232.13
>>>Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP15.phx.gbl
>>>Xref: TK2MSFTNGXA01.phx.gbl microsoft.public.windows.server.sbs:154619
>>>X-Tomcat-NG: microsoft.public.windows.server.sbs
>>>
>>>Hi,
>>>
>>>Can Intelligent Message Filter be tweaked to allow messages from specific
>>>domains?
>>>
>>>GaryK
>>>
>>>
>>>
>>
>
>
>

.

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