Exchange 5.5

Hi

I have a exchange server 5.5 SP4, OS Winnt 4 SP6. It is generating lots of
spam/NDRs. Open relay is closed on the server. Server has no virus or
spyware. I have Norton client antivirus install on all the client machines
and exchange email scanning option is turned on. There is no other antivirus
scanning the emails. I have follwoing questions.

- I think a client computer is generating all this spam/NDRs. Due to a big
network setup how can i identify the bad machine quickly?

Secondly, IMS "Outbound messages awaiting for convertion" queue is not
deleting the emails which have been delivered to actual person. It is keep
increasing and freezing the server. No one can send outbound messages. I.e. I
send an email to test email address, Test email gets my email however
Outbound message awaiting conversation queue still show as Pending email.
What can be done to rectify this problem


We are receiving inbound email however there is a delay on all incoming
emails.



Thanks is advance for the help

Faz

.

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