Terminating SMTP connection

I have alot of SMTP connections in my virtual SMTP server queue.  Most of these connections are NDR responses to spam emails going to users that do not exist.

How do I terminate these connections?  The only options it gives me is to freeze the connection, in which case the connection is still sitting there in the queue.
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turn off NDR generation.
create a distribution group with no members and add all the email addresses of nonexisting users to that group email address.
restart ur exchange server..
Brian1Author Commented:
What will creating the distribution group do?  How does that terminate the unwanted SMTP connections?
that was a suggstion  for after u clear ur smtp server..........
Brian1Author Commented:
Thanks Vahik, that helps me reduce the number of NDR's being sent out.  But my questions is specifically about the active SMTP connections.  Is there a way to terminate those connections?
well u could what u are doing ....freeze and delete in the queue or disconnect ur exchange from network then go to ESM\smtp virtual server\delivery and change the intervals to 1 ,2,,3,4, and expiretion time out to 5 minutes and restart ur server and wait
five minutes to see if queue (active connections)will be terminated ....which they should be...

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