<div>
<div class="content wysiwyg-content">
I have a customer that has an exchange server that is being used to send spam. &nbsp;It a Windows SBS Server 2003, and everything was fine until this weekend. &nbsp;I have checke dfor an open relay, there is none. &nbsp;I was able to narrow down to an IP Address that was connecting to my server to send the spam, I blocked that IP Address. &nbsp;How did this hapopen and what else can I check to see hwo it happened and also how do I prevent this.
</div>
</div>


I have a customer that has an exchange server that is being used to send spam.  It a Windows SBS Server 2003, and everything was fine until this weekend.  I have checke dfor an open relay, there is none.  I was able to narrow down to an IP Address that was connecting to my server to send the spam, I blocked that IP Address.  How did this hapopen and what else can I check to see hwo it happened and also how do I prevent this.

Exchange Server being used to send Spam

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.