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Help Checking Hosts' Spam Reputation
MTUser2012
Member
I am late to the party. For too long my servers have been inundated with spam. I've just learned how to block IP ranges in Postfix. (Yes, I know I am slow and not very bright. Being a hostmaster isn't my full time job, but I enjoy it for the most part.)
As I examine the spam that I have been receiving, it is easy to spot some of the hosts to block, HostWinds anyone? When I see a name I don't recognize I've been googling the host hame with "spammer" and seeing the results.
Would anyone have a better way of checking a host's reputation? E.g., I've received quite a bit of spam from Secured Servers in Arizona. But, I don't find much that says they are a host to spammers. When I am unsure, I usually forward the spam to the abuse email address in WHOis. No answer usually means a spammer.
Just looking for suggestions or help on getting the best content into my client_checks file.
Comments
There are several well-known blacklists out there. (Google them)
They provide tools to check IP ranges.
It can be pretty dangerous to block entire subnets, as all hosts have spammers to some extent using their service. You can end up missing out on legitimate emails if you go blocking hosts' entire range. Best to use RBLs to manage the blocking.
FYI - Secured Servers is PhoenixNAP's white label