Logon Failure: The target account name is incorrect

Background

Windows Server 2003 domain
Windows XP SP3 clients

Problem

Domain administrator is trying to access remote computer's file system via UNC administrative share e.g \\computer01\c$
Operation fails with error:
\\computer01\c$ not accessible you might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.
Logon failure: The target account name is incorrect

Solution

This issue is often caused by an incorrect DNS entry for the client computer on the DNS server. Sometimes it happens after computer is assigned a static IP address and DNS server still have a record for the old IP. Try accessing computer using its IP address. e.g. \\192.168.1.105\c$. If this works update computer's DNS record on your DNS server. Ensure that DNS server is functioning properly.

Message rejected as spam by Content Filtering

Background:

Windows Small Business Server 2008 with built in Exchange 2007 SP1
External email screening service (anti-spam and antivirus)

Problem:

Users complaining that some emails from external senders are randomly bouncing back with NDR 550 error.

Investigation:

Searched external email filtering service logs for a particular bounced back email.
Error found:
2011-08-12 18:33:55    Recipient Disposition: [250 Backend; Mode: normal; Queued: no; Frontend TLS: no]
2011-08-12 18:33:55    Message Disposition: [550 Backend Replied: System error (Mode: normal); Backend TLS: no]

It looks like email was rejected by the in-house Exchange (SBS) server.

Checked Exchange Tracking Logs. Unsurprisingly there was no trace of the rejected message. It means message was rejected at an earlier stage.

Checked Receive Connector Protocol Logs located in C:\Program Files\Microsoft\Exchange Server\TransportRoles\Logs\ProtocolLog\SmtpReceive
Note: By default Protocol Logging in Exchange 2007 is disabled. To enable it read this article.
Searched for a particular  bounced back email.
Error found:
2011-08-12T18:33:33………[removed]………..,550 5.7.1 Message rejected as spam by Content Filtering.,

Now it’s clear that message was rejected by Exchange internal Anti-Spam system

Resolution:

Exchange Management Console > Organization Configuration > Hub Transport > Anti-Spam > Content Filtering > Properties > Action
Disable Reject messages that have a SCL rating greater than or equal to 7

In this case when company uses external email screening service we could disable Exchange Content Filtering completely. Alternately we could just increase SCL threshold.

View emails filtered by Exchange Intelligent Message Filter (EIMF)

Microsoft Exchange Server 2003 Service Pack 2 comes with Exchange Intelligent Message Filter v2 built in.

Intelligent Message Filter uses heuristic analysis to stop SPAM by either by blocking them or directing to user’s Junk-Mail folder.

To configure EIMF settings open MS Exchange System Manager > Global Settings > Message Delivery > Properties > Intelligent Message Filter
Exchange 2003 Intelligent Message Filter
By Default emails with SCL (SPAM Confidence Level) 8 or higher are blocked and archived. Emails with SCL 5 or higher are directed user’s Junk E-mail folder.

To view blocked and archived emails you can simply navigate to UceArchive folder in your Exchange installation directory. Default path would be C:\Program Files\Exchsrvr\Mailroot\vsi 1\UceArchive.
Every blocked email is saved in .eml format.

It may be inconvenient to inspect blocked emails by opening them one by one.
To make your life easier you can use a free Microsoft tool called Intelligent Mail Filter Manager (IMFM).

You can download this tool from here

There is no need to install any software, simply extract all files and run IMFFilterManager.exe
When you run it the first time it will ask to specify Archive and Pickup folders.
Default Archive folder location is C:\Program Files\Exchsrvr\Mailroot\vsi 1\UceArchive
Default Pickup folder location is C:\Program Files\Exchsrvr\Mailroot\vsi 1\PickUp
Pickup folder is used to resubmit messages.

MS Exchange Server 2003
MS Small Business Server 2003

Enable Journaling on Exchange 2007

This is an example of creating and enabling a global journalling on Exchange 2007 or SBS 2008

Create a new Storage Group and Database

Open Exchange Management Console (EMC)

Server Configuration > [Server Name] > New Storage Group
Specify Storage Group name and file path and click New.

EMC > Server Configuration > [Server Name] > Journaling Storage Group > New Mailbox Database
Specify Database name and file path and click New.

Create and secure a new user

EMC > Recipient Configuration > Mailbox > New Mailbox

Create a new user mailbox and place it into newly created Journaling Database.

Select your new Journaling account and click on Properties

General Tab > Select "Hide from Exchange address lists"
Mail Flow Settings Tab > Message Delivery Restrictions > Accept messages from > Only senders in the following list
Add "Microsoft Exchange"
Select "Require that all senders are authenticated"

Enable Journaling globally

EMC > Organisation Configuration > Hub Transport > New Journal Rule
Enter a name for the Journaling Rule and select "Global - All Messages"

MS Exchange 2007
MS Small Business Server 2008

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