<div>
Well not really you can setup a SPF record for your domain(s) but that will depend if the recipenet mail servers do a spf lookup... <br />
For your server to do SPF lookups...here you go: &nbsp;<br />
<a href="http://www.msexchange.org/articles/SPF-support-Exchange-freeware.html" rel="ugc">http://www.msexchange.org/articles/SPF-support-Exchange-freeware.html</a><br />
&nbsp;<br />

</div>


<div>
Do I have to purchase GFI Mail Essential???<br />
<br />
Is SPF supported by the Exchange 2003? Do I need something extra?<br />

</div>


<div>
Make sure you have Exchange 2003 Service Pack 2 installed and then read through this article to configure Sender ID Filtering:<br />
<a href="http://www.msexchange.org/tutorials/Configuring-enabling-Sender-ID-filtering-Exchange-2003-SP2.html" rel="ugc">http://www.msexchange.org/tutorials/Configuring-enabling-Sender-ID-filtering-Exchange-2003-SP2.html</a><br />
You don't need to buy 3rd party software to make this work. <br />

</div>


<div>
I have enabled the &quot;Apply sender ID filter&quot; in the SMTP virtual server of a specific mail server...<br />
I selected &quot;reject...&quot; in Sender ID Filtering tab of properties of Message Delivery...<br />
I do a telnet xxx 25 in this server, from outside the local network (from the internet) and send an email with &quot;mail from&quot; as xxx@YYY.com (where YYY.com is the domain name which this email server serves...)...<br />
The email delivers to xxx (me)...<br />
It looks like it is not working (the SPF filter)...<br />
<br />
Any ideas?
</div>


<div>
Have you got an SPF record setup?
</div>


<div>
Yes I have already set it up and checked...
</div>


<div>
Would you like to drop me an email with your domain name, IP address and email address in so that I can check your domain settings and test from my IP address. &nbsp;If so, please email me at alanhardisty @ experts-exchange.com.
</div>


<div>
Thanks for your email. &nbsp;SPF is setup happily, so you may not have setup / enabled Sender ID Checking properly.<br />
You have enabled the Sender ID on the Message Delivery Section, have you enabled the Sender ID check on the SMTP Virtual Server properties&gt; General Tab&gt; Advanced Button&gt; Edit Button? <br />
&nbsp; <br />
After enabling on the SMTP Virtual Server, restart the Simple Mail Transfer Protocol service and let me know so that I / you can test again.<br />

</div>


<div>
Check also that you have Exchange 2003 SP2 installed.<br />
Have you got any 3rd party Anti-Spam software running on the server?<br />

</div>


<div>
It seems that do not support SPF...
</div>


<div>
<div class="content wysiwyg-content">
I have an MS Exchange 2003 server in an AD...<br />
<br />
How can I enforce the SPF?
</div>
</div>


I have an MS Exchange 2003 server in an AD...

How can I enforce the SPF?

MS Exchange 2003 - Enforce SPF

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.