Any ideas on this one, greatly received.
 
I have two seperate firewalls which appear to have similar configs on them.
 
I have enabled email alerts on both
 
When I recieve emails from one it contains the source IP address of the machine which caused the alert.  On the other machine the source is 'thisaddressdoesnotexist'.  Both have access to the same DNS servers should it be required.  Both machines are single gateways on NT4 SP6A and FW4.1 SP5.
 
 

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