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SMTP replicating (mail bombing) same message over and over.

SeanNij asked
Last Modified: 2008-01-09
Hi all,

SmallBusiness SMTP Connector is sending one email to an external client thousands of times. I have checked for virus, i have shutdown all the client pcs.

Our client recieved a legitimate email where they were cc'd together with 7 other people. Our clients server is "replicating" that email over and over to the other people that the email was addressed to. If i set the SMTP connector to a invalid smart host and watch the connector under queues, in like two hours there are 34000 messages to the same 7 people.

Completely stumped.

Does anyone know where the smtp queue is actually stored? I would like to go delete whats in there. I've checked vsi 1 / Badmail/Queues/Pickup and they are all clean.

Any suggestions?
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That gives information on how the Queue works in Exchange Server 2003.

It also links to the following Microsoft KB articles

http://support.microsoft.com/?kbid=821901 (How to flush the queue)
http://support.microsoft.com/?kbid=822944 (How to delete items from the queue)

I'm assuming that at this point you're still using SBS/Exchange 2003 (If not, you might add that information)


I have seen a similar problem where a misconfigured exchange server, which was _not_ the primary owner of a domain, would create an additional copy of the email to multiple users in the same domain.  Each time it downloaded the email from the POP3 server, it would read them, then generate new copies to each of the people on the 'To:' list - but only in that one domain.   They weren't happy about getting up to 23 copies of the same email each time a broadcast was sent out.

Hope it helps.
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Are you using the POP3 connector to collect email or is email delivered directly?
What else is on the machine? AV software, anything like that?


If your question has been answered, pleased remember to accept the answer and close the question.


Using POP3 to collect mail. Norton AntiVirus. Busy deleting the messages as per Bibliphage but there are 1000s and seem to keep coming back....
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POP connector problem. It wasn't deleting the mail from the remote host. I cleaned out all the pop accounts and once i did that it seem to go away.

You dont perhaps know the actuall "bug in the pop3 connector" ?

That's the "Many unexpected outbound e-mail messages appear in the SMTP queue in Small Business Server 2003"  knowledgebase article


Bibliophage - thankyou very much.

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