ISA 2006 Source IP Address

From: "RG" <nobody@xxxxxxxxxxx>
Date: Thu, 12 Jun 2008 00:12:40 -0400

I am publishing SMTP service to the web. I have set up a filter to block access to this service form a group of ip ranges. Can spammers do something to the packets fulling ISA server into thinking that these packets came from elsewhere?

Thanks in advance

.

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