>I get a similar effect.  However, from my research it is neither
Sonicwall
>or Imail causing the problem.  In my case, I found the source server to
be
>my ISPs DNS server.  They explained to me that some DNS requests are
>terminated before the response is given and then the DNS server
attempts to
>locate the requester by searching ports, which looks like a port scan
to the
>sonicwall.  I don't have a solid understanding of the DNS conversation
that
>causes this, but I have not seen regularly from any other machines, so
I'm
>not too worried at this time.

I have also experienced this.

John Tolmachoff
IT Manager, Network Engineer
RelianceSoft, Inc.
Fullerton, CA  92835
www.reliancesoft.com

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