How Far Will Email Operators Take Blocklisting to Prevent Spam?

Security administrators use firewalls, web proxies, or antispam gateways to block traffic sources that exhibit suspicious or known attack pattern behaviors. Blocking individual IP addresses has been a staple defensive measure for years. Security system administrators have also blocked entire IP network allocations to mitigate attacks and on rare occasions, they have blocked all of the addresses that have been allocated to an ISP. Are enterprise and ISP email operators poised to apply similarly sweeping security measures to protect their organizations against perceived or reported domain name abuse by blocking TLDs to manage spam? Image by Waxy Dan The Roles…

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