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High outgoing smtp message with unknown "senders" on SBS 2003 Server

We are suddenly getting a large amount of outgoing messages (230000 so far) in the SMTP connector on our SBS 2003 server. Messages are showing to be sent from multiple unknown senders so I am unsure as to where they are coming from. I have changed the SMTP to forward the messages to thru a bogus ip address and am in the process of removing the the messages. (A Long and arduous process!) But I need to track down where they came from and how to prevent it in future. Help would be appreciated.
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nathra
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nathra
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1 Solution
 
Noam_KuilboerCommented:
You might want to see if you are an open relay. and if you are shut down relay on your SMTP.
http://technet.microsoft.com/en-us/kb/kb00324958.aspx 
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nathraAuthor Commented:
I followed the steps but now the build up is in the "Messages waiting to be routed" in the default virtual server.
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nathraAuthor Commented:
Skip that last comment. I believe there were error message the server was sending because I was deleting with ndr.
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nathraAuthor Commented:
An add on to this question is that, due to this issue, I moved the exchange log file to another drive I have on the server. It is now keeping its log there but there are some old log files on left in the old folder. Can I delete these without issue?
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Noam_KuilboerCommented:
You should be able to but wait for a full backup cycle. You can see the last full backup in the Database tab of your mail store properties.
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