<div>
Based on the solutions provided, we were able to determine a work station that was generating the spam. &nbsp;We also used the information to check the Exchange server settings.
</div>


<div>
<div class="content wysiwyg-content">
I have an Exchange Server 2000 that is sending out mass emails. &nbsp;We got blacklisted from several ISP's, so now we use a company called dyndns to use as a smart host and send email through it. &nbsp;Only problem is that we have to pay them a small fee per 300 messages a day. &nbsp;We bought 4 to allow 1200 emails aday go out, &quot;which is way more than enough&quot; &nbsp;We keep sending out way more than 1200 a day due to a pc on the network that is infected and mass mailing spam out, which probably caused the blacklist in the first place. &nbsp;My Question is how do i go into exchange and find out who is to blame, or is there a setting in exchange to block mass emails from ever leaving us? 
</div>
</div>


I have an Exchange Server 2000 that is sending out mass emails.  We got blacklisted from several ISP's, so now we use a company called dyndns to use as a smart host and send email through it.  Only problem is that we have to pay them a small fee per 300 messages a day.  We bought 4 to allow 1200 emails aday go out, "which is way more than enough"  We keep sending out way more than 1200 a day due to a pc on the network that is infected and mass mailing spam out, which probably caused the blacklist in the first place.  My Question is how do i go into exchange and find out who is to blame, or is there a setting in exchange to block mass emails from ever leaving us? 

Exchange is sending out mass emails, how do i track down which pc on network that is doing this?

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

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

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.