Exchange 2003 SP2 running on SBS queues flooded with spam

One of my clients is running SBS 2003 with Exchange 2003 SP2.  We've been having a problem for days with the queues flooded with thousands of SPAM messages.  First thing we checked was for an open relay, which the server is not.  I followed some of the tips mentioned in other EE posts, but so far I haven't been able to get to the bottom of this.  The server has been cleaned of any virus infections, we unplugged all of the workstations and left only the server on over the weekend, and Saturday morning there were thousands of messages queued.  I disabled all of the user accounts in case one of them was hacked, changed the administrator password, etc... but the queues qould still build up.  In the SMTP virtual server properties I disabled anonymous authentication, which did stop the spam, but users were unable to receive email.  We tested from our Exchange server and the messages would sit in our queue.  I enabled logging on the SMTP virtual server, but that didn't give us any information.  We have spent hours and hours trying to figure this out with no promising results.  I am at my wits end here, and I would appreciate any help I could get.  Any ideas?  I keep disabling SMTP and purging the queue folder, force closing connections, etc...  
Thanks!
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szagoriaAsked:
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szagoriaAuthor Commented:
I ended up recreating the SMTP virtual server, connectors and the queues went away.  Odd, but solved.
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8ubterfug3Commented:
What is your email domain if you don't mind me asking?
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szagoriaAuthor Commented:
stiecohen.com
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8ubterfug3Commented:
Right click on your Default SMTP Virtual Server in System Manager. Go to the Access tab then click on Relay. What options are checked in there?
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szagoriaAuthor Commented:
For relay, "only in ithe list below", and Allow all regardless is unchecked.  I have left the list blank and put the local IP of the server in the list, neither did anything for the spam problem.
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8ubterfug3Commented:
I don't have much experience with anything other than SMTP in Exchange but is it possible they are using POP or IMAP to spam? How is the authentication configured on those?
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Alan HardistyCo-OwnerCommented:
Please have a read of my article - which might reveal that you are an authenticated relay:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2556-Why-are-my-outbound-queues-filling-up-with-mail-I-didn't-send.html

If you are - the info to resolve the issue is also within my article.

Alan
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szagoriaAuthor Commented:
At this point, I'm thinking anything is possible.  I've disabled POP and IMAP virtual servers.
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Alan HardistyCo-OwnerCommented:
You are most likely an Authenticated Relay - please check my article, increase the logging if the messages are not from Postmaster@yourdomain.com and then identify the account that is being abused.

Alan
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szagoriaAuthor Commented:
Alan, I tried that yesterday (I read your article yesterday morning).  I didn't see anything trying to authenticate, si when the logs didn't clue me in, I just started diabling user accounts, changed the admin password, but the queues were still clogged.  
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Alan HardistyCo-OwnerCommented:
Okay - who is the sender of the emails?  Postmaster or random users not on your domain?
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szagoriaAuthor Commented:
There are a few postmasters, but 99% are random users.
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Alan HardistyCo-OwnerCommented:
Okay - do yo uhave any users externally sending mail to your server via SMTP?

If you don't please disable Basic and Integrated Windows Authentication from your SMTP Virtual Server and then restart the SMTP Service.

Does that stop the flood of spam?

Please also use aqadmcli.exe to zap the current queues:

ftp://ftp.microsoft.com/pss/Tools/Exchange%20Support%20Tools/Aqadmcli/aqadmcli.exe

To delete messages from a specific domain type the following into a command prompt:
aqadmcli delmsg flags=sender,sender=sender@domain.com

Change the sender@domain.com to match what is in your queues
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szagoriaAuthor Commented:
Recreating everything solved the issue.
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