Scarab posted a very useful comment about blocking IP addresses of particular countries and also particular IP ranges that belong to particular ISPs that tend to host large numbers of spammers.
That was a very helpful post but I am not sure how to follow up on it and thought I would start a new thread and get some ideas.
I would like to implement a few of these weights and see what effect that has on permanently blocking some spammers. But I am not sure how to:
1) derive IP address blocks for ISPs whom I would like to block
2) derive IP address blocks for countries whom I would like to block
For starters, I would like to block incoming mail from:
I would also like to block incoming mail from some of these guys:
B2 Net Solutions Inc.
Host Sailor Ltd
Interactive 3D B.V.
Limestone Networks, Inc.
I see the interface in SmarterMail 13 where I can block ranges of IP addresses: Security ---> Blacklist.
How can I derive correct values for IP ranges to block, for countries and for ISPs?
Thank you for your ideas.