7 Besoins des utilisateurs Pouvoir synchroniser ses messages depuis n'importe quel reseau : –A l'hotel, depuis l'aeroport –Sur son PC portable Consulter sa boite aux lettres, repondre aux messages urgents, acceder a ses donnees de n'importe quel emplacement Avoir acces aux donnees de l'entreprise de facon securisee. 8 Besoins des professionnels de l'informatique Pouvoir controler le contenu entrant et sortant: –Les messages delivres dans les boites aux lettres sont sain. 15 Gestion des sessions OWA 2007 OWA est delivre par le serveur ayant le role CAS (Client Access Server) Acces par defaut en HTTPS avec un certificat autosigne.
22 Gestion des pieces jointes Acces relaye aux points de partage internes par Exchange 2007.
23 Gestion des contenus externes Les images sur des sites distants ne sont pas telechargees automatiquement: –L'utilisateur peut valider le telechargement. 26 Signature et chiffrement des messages Composant ActiveX a installer: –Composant Exchange 2007 compatible avec le composant Exchange 2003 SSL est requis entre le client et le serveur CAS. 29 Outlook Mobile Acces a sa messagerie depuis un peripherique tournant avec Windows Mobile.
30 Peripheriques Windows Mobile Systeme d'exploitation du peripherique fournit par Microsoft aux constructeurs.
31 Fonctionnement d'Outlook Mobile Acces aux serveurs Exchange de l'entreprise a travers un canal de communication securise en HTTPS. 33 Gestion des peripheriques mobiles En cas de perte ou vol : –Peripherique mobile verrouille par code PIN. 35 Gestion des peripheriques mobiles Strategies d'entreprise permettant : –D'imposer le support du verrouillage par code PIN. In this article I will go through the most interesting fixes, improvements as well as new features included in Exchange 2003 SP2.
Exchange 2003 SP2 is more than just an ordinary Service Pack which fixes a couple of bugs; it contains numerous bug fixes as well as several feature enhancements and completely new features. This article is based on the latest Exchange 2003 SP2 BETA build, which at the time of this writing was build 7623.0.
If you don’t think the figures in this article does enough to suit your appetite, you could install the CTP version in your lab and checkout the different new features and enhancements, actually I recommend you do so as this will give you a much better understanding of the different features in Exchange 2003 SP2.
One of the really interesting changes that comes with Exchange 2003 SP2, is the new database size limit in Exchange 2003 Standard Edition. In order to protect your Exchange 2003 Standard edition server from unintentional rapid growth, Exchange 2003 SP2 by default sets the limit to 18GB. It’s worth mentioning that it’s not only the Mailbox Store limit size that are increased, but also the Public Store, so if you add them together you now have 150GB database storage available. Note:This new database limit’s also applies to SBS 2003 Servers with Exchange 2003 SP2 applied. Although Microsoft is planning to remove Public Folders from the Exchange product, this won’t happen before we see the release of E13, yes you read that right E13 (the version that’s to be released after E12).
The biggest change when speaking Public Folders is the removal of the Propagate Settings option from the Public Folder context menu, shown in Figure 2 below.
Exchange 2003 SP2 replaces it with a new Manage Settings option (see Figure 3), as too many Exchange administrators have had a hard time understanding the real function of the Propagate Settings feature. When selecting Manage Settings by right-clicking a Public Folder containing a subfolder in the Exchange System Manager, we’re presented with the screen shown in Figure 4 below.
As you can see a new Manage Public Folders Settings Wizard is opened, when clicking Next, we can choose between three options Modify client permissions, Modify lists of replica servers and Overwrite settings as shown in Figure 5. If selecting the first option in Figure 6, we have the option of adding a user, removing a user, modifying a user, or replacing a user. If selecting the second option in the first screen (Figure 5), which is Modify lists of replica servers, we can add, remove or replace a server from the replica list as shown in Figure 7. If we select the third option in the first screen (Figure 5), which is Overwrite settings, we have the option of choosing between eleven different types of options to overwrite (see Figure 8). When you have made the respective selections through the Manage Public Folders Settings Wizard, you get a summary screen showing what will be changed (see Figure 9).
Another Public Folder related change is that you no longer can delete a Public Folder store that contains data not yet replicated (including System Folders!); you first need to move all existing replicas to another server or delete the unnecessary individual folder(s).
With this option you can with a few clicks move all content from one Public folder store to another. Other Public Folder enhancements in Exchange 2003 SP2 includes Logging of public folder deletions, the option of stopping and resuming Public Folder content replication on the fly (see Figure 11 below).
Exchange 2003 SP2 also introduces Offline Address Book version 4 (OAB 4.0), which is a new type of OAB that was designed to help remove most of the OAB download related problems many of us have or still are experiencing, as well as improve performance.
Among the enhancement introduced with OAB 4.0 are improved logging, reduction of the size of OAB files (up to 30%), differential OAB update files using a new generic binary compression technology known as BinPatch and OAB indexing based on locale setting (language and country). Exchange 2003 SP2 introduces a new method with which you can allow or deny Outlook MAPI access on a per user basis.
MAPI access will be controlled via a new ProtocolSettings attribute string, which is set on a mailbox-enabled AD user object for example by using ADSIEdit.
Note:The MAPI access ProtocolSettings attribute string doesn’t apply, when a mailbox is accessed via delegation.
There are several enhancements in Exchange 2003 SP2 when it comes to protection against SPAM, most noticeable are the new version 2 of the Intelligent Message Filter and the Sender ID implementation.
When Exchange 2003 SP2 has been applied you will have the option of entering the IP address for any servers deployed in the organizations perimeter network (aka DMZ), as well as the range of IP addresses within the organization see Figure 13). As many of you already know Sender ID is an e-mail industry initiative invented by Microsoft and a few other industry leaders. Exchange 2003 SP2 adds a Sender ID Filtering tab (see Figure 14) which helps defend against spam and phishing schemes. In order to use Sender ID filtering you need to enable Sender ID filtering on all SMTP virtual servers accepting mail from the Internet, but it’s not necessary to enable the option on the Exchange mailbox servers in your organization. The SmartScreen-based Intelligent Message Filter (IMF) which was developed by Microsoft Research and which also is used with the Hotmail product and Outlook 2003 is with Exchange 2003 SP2 an integrated part of the System Manager. IMF version 2 will also support a new anti-phishing technology, which will use a so called Phishing Confidence Level (PCL) value to impact the Spam Confidence Level (SCL) ratings further. Note:When upgrading an Exchange 2003 Server to Exchange 2003 SP2, it’s important you uninstall IMF version 1 from the server first.
One of the biggest additions to Exchange 2003 SP2 is without a doubt the new mobile device enhancements.
When taking Properties of the Mobile Services object in the System Manager, the first change you notice is Direct Push over HTTP(s) option (see Figure 16). Direct Push is a new technology which ensures a mobile device always is up to date with the content of the mailbox. Note:You can also configure your Windows 2003 Mobile devices to use a feature called Always-up-to-date (AUTD), which basically notifies you of updates to your mailbox, by sending a “new e-mail” SMS message notification is sent to you’re your mobile device. Direct Push keeps a constant open connection to the server via IP, this means that as soon as a change is made to the mailbox a trigger will be sent to the mobile device, which then will be updated almost instantly. You can even specify a list of user accounts that should be excluded from the specified policy; this is done by clicking on the Exceptions button which will bring us to the screen shown in Figure 18.
Exchange 2003 SP2 will also support certificate-based authentication in order to eliminate the need of storing corporate credentials on a mobile device.
Exchange 2003 SP2 in conjunction with Windows Mobile 5.0 will also be able to do Exchange Global Address List (GAL) lookups.
There’s also been made a significant change to how an Exchange ActiveSync (EAS) user authenticates to the Exchange Server. But Exchange 2003 SP2 will use the SMTP mailbox addressing scheme (which is the schemes OWA uses when Exchange 2003 SP1 has been applied).
I won’t list all the bug fixes included in Exchange 2003 SP2 in this article, for a list I instead recommend you checkout the Exchange 2003 SP2 CTP Release Notes, which are available by clicking here. Exchange 2003 SP2 is a huge service pack which is packed with both completely new features as well as enhancements to existing features.
Henrik Walther is a respected writer with special focus on Microsoft Exchange and Office 365 solutions.
This information-packed event is presented by MSExchange.org and is designed for busy IT Professionals within the global MS Exchange and Office 365 Community, as a convenient and cost-effective opportunity to get the latest information on important Office 365 and Exchange topics from leading experts and vendors. As companies begin relying more on Skype for Business for their communications and application delivery, performance and reliability become paramount. How hardware load balancing can provide better monitoring and availability of front-end and edge server pools.
The new Citrix SD-WAN solution that can ensure quality through unique QoS and path selection technologies for MPLS, DSL and Internet. How performance for audio and video can be enhanced for virtually deployed desktop Skype clients.
In the first part of this article series, we had a brief look at what DKIM is, how it works in Office 365 and started the process of enabling outbound DKIM-signing for our domain.
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In this article we will continue where we left off, that is we will uncover the rest of the anti-spam filtering agents that are included with the Exchange 2007 Edge Transport Server role.
The Content Filter agent can be considered the next generation of the Intelligent Message Filter (or IMF version 3), which most of us know from Exchange Server 2003 (version 2 came with Exchange 2003 SP2). The Content Filter can also, via spam signatures, analyze messages for phishing characteristics. Just as was the case with IMF in Exchange Server 2003, you can, with the help of the Content Filter, assign a spam confidence level (SCL) rating to the message flowing in to your organization. If a message equals the SCL delete threshold, the message will be deleted without notifying the sending server. Depending on how many recipients as well as how many messages are received by your Exchange organization, configure a reasonable quota for this mailbox.


Set up delegation if you are going to open the mailbox as an additional mailbox under your primary mailbox account.
All quarantined messages will now be sent to the specified E-mail address, so be sure to check it for any false positives on a regular basis. If you for some reason do not want to block any messages destined for a particular SMTP address, you can add the address to an exceptions list (see Figure 3). The Content Filter agent also includes another anti-spam feature, which is not visible in the Exchange Management Console GUI. In order to reduce the amount of false positives on the Edge Transport server, the Content Filter agent can let the E-mail addresses and domains configured on the Safe Sender list be allowed to pass through to the end-users mailbox without additional processing by the rest of the filtering agents by using safelist aggregation. Even though you have enabled the Content Filtering agent, you still need to enable and configure the safelist aggregation feature before you can make use of it. Logon to the Exchange 2007 server which has the Mailbox server role installed then open the Exchange Management Shell (EMS).
In order to read the Safelist collection from each user’s mailbox and then hash and write it in the respective user objects in Active Directory, you will need to run the Update-Safelist CMDlet. Since the Update-Safelist CMDlet is a onetime only command, you would need to use the Windows Scheduler in order to schedule the CMDlet to run, let’s say one every 24 hours. Now save the batch file as Update-Safelist.bat or something similar (remember to change Notepad to all files instead of txt files). Note:In order to use ADSI Edit you need to install the Windows Server 2003 Support Tools on the respective Exchange 2007 server.
To see whether Safelist aggregation works as expected on the Edge Transport server, try to add a custom word or phrase to the Custom Words block list which is found on the Property page of the Content Filter. In addition to the Safelist aggregation feature, the Content Filter agent includes one more feature that will help reduce the amount of false positives in your Exchange organization. Note:If no computational postmark header exists or if the header is invalid, the SCL rating will not be changed. As most of you are aware, Exchange Server 2003 did not include a functionality that let you filter out specific attachments, instead you either had to create your own SMTP OnArrival Event Sink, use a 3rd party product or strictly rely on the OWA 2003 and Outlook 2003 attachment control feature, but since you really should filter out unwanted attachment types on an SMTP gateway in your perimeter network (aka DMZ or screened subnet) before they arrive to your internal network, the last two options are not recommend. Side note:In recent years there has been increasing focus on deploying messaging environments, where each individual E-mail message is either digitally signed or encrypted or even protected using Information Rights Management (IRM).
The Attachment Filtering agent applies right after the Content Filtering agent, and can be configured using the Add-AttachmentFilterEntry CMDlet. Before we start to configure the Attachment Filter agent, we first need to make sure the agent is enabled. If you later on want to remove an attachment filter entry, you do so using the Remove-AttachmentFilterEntry CMDlet. In order to be able to use more advanced features such as scanning files in a ZIP file, you would need to install Forefront Security for Exchange Server (which we will talk a bit about later in this chapter) or a supported 3rd party product.
As mentioned you can either choose to block a whole message including the attachment (will return a delivery status notification to the sender), strip the attachment but allow message through (will replace the attachment with a text file explaining why the attachment was stripped) or silently delete both the message as well as the attachment (will delete both without notifying the sender). You can also configure a custom response message that will be included in the delivery status notification, which is returned to the sender when a message and an attached file are blocked. Note:All attachment filter entries on an Edge Transport server uses the same attachment filtering behavior, that means same custom response message as well as action (Reject, Strip or SilentDelete). The last thing I wanted to mention concerning the Attachment Filtering agent is that you can exclude a list of connectors from attachment filtering, which means that attachment filtering isn’t applied to messages flowing through the specified connectors. The Edge Transport server also includes a brand new anti-spam feature called Sender Reputation. The Sender Reputation agent also performs a reverse DNS lookup when an external SMTP server establishes an SMTP session. As you already know an inbound message is assigned an SCL rating when the Content Filter is applied. Lastly the Sender Reputation agent is capable of performing an open proxy test against the senders IP address. Note:In order for the Edge Transport server to perform an Open Proxy text against an external server, keep in mind that you need to open the required outbound ports in any firewall located between the Edge Transport Server and the Internet. Depending on the result of the above mentioned analysis and tests, the Sender Reputation agent assigns a Sender Reputation Level (SRL) to the sender. The Sender Reputation agent does not affect how blocked messages are handled, this is instead controlled by the Sender Filter agent, which can be configured to block, reject or stamp message with blocked sender and continue processing. After a given message has been through the Attachment Filter it will be scanned by the antivirus product installed on the server, this could be ForeFront Security for Exchange Server 2007 (which is included in the Exchange 2007 Enterprise CAL) or a supported 3rd party product. It should come as no surprise the Edge Transport server role integrates perfectly with the ForeFront Security for Exchange Server 2007 product, but the server role also has rich support for partner antivirus providers.
When a message has been through all the filtering agents, the message will finally be sent to the recipient(s) mailbox, where the Outlook Junk E-mail Filter will take the appropriate action depending on the SCL rating of the message.
In part 4 and 5, we went through the antispam agents included with the Edge Transport server role.
Les systemes dinformations des entreprises sont des cibles classiques pour les codes malicieux et le contenu inapproprie: –Virus, contenu offensant, … La messagerie (asynchrone ou instantanee) est un vecteur majeur pour ces menaces. Risques lies a Outlook Web Access: –Session restee active, reutilisation des informations de securite.
Mode d'authentification par formulaire par defaut –Methodes d'authentification tierces supportees (avec ISA 2006) : RSA SecurID, Radius.
Les constructeurs fabriquent le peripherique et adaptent le systeme (drivers, fonctionnalites …). But bear in mind the CTP version is a pre-release evaluation which isn’t supported by Microsoft Support Services. As many of you know the Standard edition has a hard-coded 16GB limit which with Exchange 2003 SP2 is changed to 75 GB! Although Public Folders are to be removed from Exchange, Microsoft still spends a considerably amount of time enhancing the way Public folders work, and fortunately several of the enhancements have made it into Exchange 2003 SP2.
The Propagate Settings options let’s an Exchange administrator copy particular properties of a selected Public Folder to the subfolders underneath it, but a general misunderstanding is this option also propagates changes made to Access Control Lists (ACLs). Doing so via the new Manage Public Folder Settings Wizard would require a lot of work, so Microsoft will with Exchange 2003 SP2 let you right-click the Public Folder store itself, where you can select a new context option – Move All Replicas as can be seen in Figure 10. This is a welcome addition especially to Exchange shared hosting providers, who often provides different types of subscription packages – such as one allowing OWA access, another allowing OWA and Outlook MAPI access etc. You can also control whether an Outlook MAPI client running in non-cached mode should be allowed access or not. Specifying these IP addresses is necessary if you enable either Sender ID or Connection filtering behind the perimeter network. The purpose of Sender ID is to help counter spoofing, which is the number one deceptive practice used by spammers.
As you can see it’s possible to choose from three different options of which Accept is default selected. This means you no longer need to install IMF separately when deploying new Exchange 2003 Servers in your Exchange organization. In addition expect IMF version 2 updates to be released on a more frequent basis than what’s been the case with version 1. With Exchange 2003 RTM or SP1 you need to specify pre-defined intervals (the most frequent being 5 minutes) at which the mobile device will update with any new content available in the mailbox (messages, calendar appointments, tasks and contacts etc.). But based on customer feedback regarding the limitations of using SMS to notify a mobile device, Microsoft took the step to develop the Direct Push technology. Also features such as an administration tool for the remote wipe feature will be released as a separate web release, as has previously been the case the Intelligent Message Filter (IMF), OWA Admin, and Exchange Best Practices Analyzer (ExBPA) etc. With Exchange 2003 SP2 it will be possible to set a central policy on the mobile devices used by the Exchange users within the organization. Expect the feature to be similar to Microsoft Global Contact Access that was released back in July 2005. As some of you might know the default way Exchange authenticates EAS users is by taking the primary SMTP address, strip out the left hand side (LHS) of the address and then use that as the mailbox name. This scheme makes it possible to use the full e-mail address specified as part of the URL, instead of the mailbox name. As you have seen in this article especially the anti-spam, public folder administration and mobile devices features has been on top of the list when Exchange 2003 SP2 was developed. This means that the Content Filter is based on the SmartScreen technology which originally was developed by Microsoft Research. And if the message is a phishing attempt, the Content Filter agent will stamp it with a property before delivering it to the recipients Inbox. The Content Filter stamps the messages that it inspects with an SCL property (actually a MAPI property), with a value between 0 and 9. If the message equals the SCL reject threshold the message will also be deleted, but a rejection response will be returned to the sending server.
When you find a false positive you can resend it to the original recipient by opening the message, then clicking Resend.
It is called safelist aggregation and is a feature which collects data from the Safe Senders and Safe Recipients lists, which can be found under the Junk E-mail Options in Outlook 2007 (see Figure 4). If you make use of the EdgeSync service these lists will, as part of the recipient data, be replicated from Active Directory to the ADAM store on the Edge Transport server. If you enable Also trust e-mail from my Contacts under the Safe Senders tab in Outlook 2007 (see Figure 4), all Outlook Contacts in the users mailbox will be allowed to pass through the filtering agents as well, pretty neat right? When using the Update-Safelist CMDlet provide the identity for the mailbox you want to run the CMDlet on. Now add the E-mail address of the private E-mail account (such as a Hotmail, etc.) to the safe senders list of your mailbox in Outlook 2007. The feature is called Outlook E-mail Postmark Validation which is a computational proof that Outlook applies to all outbound messages in order help recipient messaging systems to distinguish legitimate E-mail messages from Junk E-mail.


On a default installation of the Edge Transport server role the Outlook E-mail Postmark Validation feature is enabled by default, but to verify the feature indeed is enabled on your system, you can open an Exchange Management Console and type Get-ContentFilterConfig (see Figure 5). I would say that an attachment filtering mechanism should have been a native feature in Exchange a long time ago, but finally the wait is over as the Edge Transport server in Exchange Server 2007 lets us do attachment filtering at the server level (hooray!). Here in Denmark, where I live, governmental institutions have a strong desire for protecting the messages while they are in transit.
Unfortunately there is no way to configure Attachment Filtering via the Exchange Management Console GUI, you will have to do so using the Exchange Management Shell. In order to do so you will need to open the Exchange Management Shell (EMS) and type Get-TransportAgent. This will give us a list of all file name extensions and content types that the attachment filtering agent can filter on (Table 1). The Sender Reputation agent which is enabled by default (although only for externally received messages) is an anti-spam feature that blocks inbound messages according to characteristics of the sender. This is done on a per-sender basis which makes it easier to see whether it’s a spammer or a legitimate sender.
If the connection is looped back to the Edge Transport server through known open proxy ports and protocols, more specifically SOCKS 4 and 5, Wingate, Telnet, Cisco, HTTP CONNECT and HTTP POST, the sending server is considered an Open Proxy.
Only after the Edge Transport server has received 20 or more messages from a particular sender is an SRL calculated.
So you’re not bound to using the ForeFront Security for Exchange Server product if you choose to deploy an Edge Transport server in your organizations perimeter network (aka DMZ or screened subnet). If the message has an SCL rating which is equal to or greater than the SCL Junk E-mail folder threshold, which is specified on the Content Filtering property page, it will be moved to the Junk E-mail folder in the recipient’s mailbox. I explained in which order the agents trigger on an inbound message as well as provided miscellaneous tips and tricks in regards to the configuration of the agents and this Exchange 2007 server role in general.
Les utilisateurs sont de plus en plus nomades: –Au sein de l'entreprise –Chez les clients et partenaires Le besoin d'acces a ses messages est permanent. Pouvoir forcer le chiffrement des echanges: –Les echanges avec certains partenaires sont chiffres.
C'est l'utilisateur qui accede a sa boite aux lettres: –Pas de comptes systeme ou super utilisateur –Confidentialite des donnees garantie de bout en bout.
Acces aux partages internes ou sites sharepoint : –Pas de VPN, Exchange telecharge le document pour l'utilisateur (similaire a WebReady pour OWA).
Therefore it’s strongly recommended you only install this version in your test labs and not on any production server(s).
Yes you heard me right finally Microsoft reacts to years of yielding from frustrated Exchange Administrators. One of the goals with Exchange 2003 SP2 is to make administration of Public Folders more efficient; the primary reason here fore is to eliminate the high number of support calls Microsoft Support Services receives on Public Folder issues.
Sender ID works by verifying every e-mail message indeed originates from the Internet domain from which it was sent.
The included version is version 2, which will replace IMF version 1 approximately 6 months after Exchange 2003 SP2 is released. As you can see in Figure 17 below, you can set all sorts of different policies such as minimum password length, whether the password should be complex, inactivity for number of minutes, wipe device after x number of failed attempts (this erases the devices completely), refresh settings in hours as well as whether access should be allowed to devices that doesn’t support password settings. But as some of you may know (especially Exchange share hosting providers) this can cause problems when hosting multiple companies in your Exchange organization.
The benefit of this “new” scheme is that it let’s you host multiple companies with each their domain, and having all of them use sync with EAS without the need to create additional virtual folders etc. Exchange 2003 SP2 is expected to be released later this year, and since Microsoft’s plan is to release Exchange 12 (E12) in the end of 2006, we can be pretty sure this will be the last service pack for Exchange Server 2003, but if we look at what’s included in Exchange 2003 SP2 there’s really not that many things to miss until the next major release – Exchange 12 (E12)!
When an E-mail message is received by an Edge Transport server with the Content Filter agent enabled, it will evaluate the textual content of the messages and then assign the message a spam confidence level (SCL) rating based on the probability the message is spam.
When it is delivered Outlook 2007 will render it differently and warn the user that this most likely is a phishing attempt. If a message equals the SCL quarantine threshold, the message will be sent to the E-mail address specified in the Quarantine mailbox e-mail address: field. Since we want to run the Update-Safelist CMDlet on all Mailbox users on the Mailbox server, we will need to make use of piping. Finally send an E-mail message, containing the word or phrase you added to the block list, to your Exchange 2007 Mailbox user account.
With Outlook E-mail Postmark Validation enabled the Content Filter agent will parse all inbound messages for a computational postmark header.
We now have the possibility of filtering out messages based on attachment file name, file name extension, or file MIME content type. If you are doing the same in your organization or are planning on doing so, you should bear in mind that stripping an attachment from either a digitally signed, encrypted or IRM protected E-mail message will invalidate the message, so that it becomes unreadable.
I do not really know why this feature has not been included in the GUI, but my guess is that the Exchange Product team did not have the time to integrate the feature in the GUI. On a default installation of an Edge Transport server this agent should be enabled by default, but if it for some reason is disabled you can enable it by typing Enable-TransportAgent -Identity "Attachment Filtering Agent" then hitting Enter. The agent actually relies on persisted data about the sender, so that it can determine which action to take on inbound messages. If the IP address does not match the resolved domain name, there’s a good chance we’re dealing with a spammer. The agent calculates statistics about a sender by looking at how many messages from that sender in the past, had either a low or high SCL rating. As you can see in Figure 7 you enabled this feature on the Property page of Sender Reputation. If you’re using a proxy server in your organization you also need to configure the Sender Reputation agent to use the proxy server for Open Proxy tests. The higher a SRL rating that is assigned to a sender the more likely is it the sender is a spammer.
Details about the Outlook 2007 Junk E-mail filter are out of the scope of this article, but I can say that the filter has been improved even further since Outlook 2003. Next time, I will give you an insight into how you can deploy a load balanced Edge Transport server setup in your perimeter network. It’s also worth noting that you can’t uninstall an Exchange Service pack, so if you apply Exchange 2003 SP2 to a production server, you won’t be able to uninstall it afterwards (you would instead need to restore form the most recent backup).
If you ask me this was something that should have been changed back when Exchange 5.5 SP4 was released. This is accomplished by checking the address of the server sending the mail against a registered list of servers that the domain owner has authorized to send e-mail.
Fortunately the SMTPProxy registry key takes care of most of the EAS authentication problems, as it can check all SMTP Proxy addresses of a particular user. When the message is viewed in Outlook 2007 all content will be flattened, any links will be disabled and no images will be loaded.
Bear in mind that before a message can be quarantined you need to create and configure a mailbox that should be used for this purpose. If a valid as well as solved computational postmark header is present in a message, it means that the client computer that generated the message solved the computational postmark. We even have the choice of filtering out both the message and the attachment or just strip the attachment.
One way to solve this problem, focusing on digitally signed or encrypted messages, is to put up some kind of blackbox, which takes care of signing and encrypting the messages after the attachment filter has processed them. If this is the case we can expect it to be included in Exchange Server 2007 Service Pack 1, but only time will tell. In addition they often try to provide a local domain name, which is the name of the organization to which the Edge Transport server belongs. Under the Action tab which also is found on the Sender Reputation property page, you can configure a SRL Block Treshold (see Figure 8), and when the threshold is exceeded the sender is added to the IP Block list for a specified amount of hours (default is 24 hours). Any modified OWA forms-based authentication logon pages you have modified will also be overwritten, when applying Exchange 2003 SP2, so remember to back up any modified logon.asp pages before you begin. Come on when you think about it 16GB is the limit on our MP3 player’s disk these days, and should definitely not be a limit to fight against on your Exchange Server(s). The Content Filter is regularly updated using the Anti-spam Update Service (Windows Update) in order to ensure that it always contains the most up to date information when running.
The result of a postmark validation will be used when the overall SCL rating for an inbound message is calculated. We can even choose to delete both the message and attachment silently, meaning that both will be deleted without notifying the sender of the message.
The company I work for has got such a product which is becoming more popular here in Denmark. For details on how to configure a proxy type Get-Help Set-SenderReputationConfig in an Exchange Management Shell (EMS) or see the Exchange Server 2007 Help File.
En cas d'oubli : –Code de deverrouillage du mobile accessible sur Outlook Web Access (pas d'appels au helpdesk). Since the Content Filter is based on the characteristics of many millions of messages (Hotmail among others are used to collect the necessary information about both legitimate as well as spam messages), it recognizes both legitimate messages and spam messages.
The Content Filter can very precisely determine whether an inbound e-mail message is a legitimate message or spam.



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