What third party tools out there might let me do this? The software I'm setting up on the gateway will not let me block IP ranges, only domains and email addresses (which is somewhat useless to me). Being able to block whole IP ranges has proven rather useful in reducing spam in our domain.
The only program I'm familiar with is ours, Declude JunkMail, which will allow you to do that. It will always see the IP that connects to the gateway (assuming that you let Declude JunkMail know that you have the gateway), so you would just create an IP blacklist.
-Scott
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