SBS2003 - spam relaying through our server

SBS2003 with 5 XP Clients.

In Outlook on the xp clients I have noticed there is alot of bounce backs from foreign/chinese sites which we have not sent out.

On SBS2003 > I looked at Exchange System Manager > Server > Queues
There is messages leaving from 136.com & pacificpoker.com which are not anything we have sent out.

Any suggestions?
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unrealone1Asked:
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abhijitmdpCommented:
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unrealone1Author Commented:
I'll try the suggested solutions
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unrealone1Author Commented:
Update, sorry for late reply.

Our server is not an open relay and I have enabled everything in your 2links. I have run a full scan with malwarebytes and superantispyware, it didn't really find anything.

The server is sending emails out from info@ourdomain.co.uk only, so the info mailbox is getting 30-40bounce backs from random domains every hour. No one logs into the network with the info login, so it must be coming from the server rather than an infected PC.

Any suggestions?

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unrealone1Author Commented:
bump
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unrealone1Author Commented:
Is it possible, this is happening?

(1)      Spam email is sent to my SBS server (user doesn’t exist)
(2)      SBS Server sends non delivery report to the spam server (user doesn’t exist)
(3)      Non delivery report is sent back to SBS Server
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unrealone1Author Commented:
Any one got any thoughts on the above
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unrealone1Author Commented:
This was the issue, turned off NDRs in exchange.
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