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When DNSBLs Go Bad

I have often remarked that any fool can run a DNS-Based Blacklist (DNSBL) and many fools do so. Since approximately nobody uses the incompetently run black lists, they don't matter. Unfortunately, ... read more

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SPF Overview

It would be a bad choice for a broadband provider like Comcast ... is spammy and get it right for each of the 4.2 billion IP addresses. No wonder DNSBLs come and go—their maintainers burn out and give ... read more

The Impending End of Traditional .forward-style Forwarding

Trying to send mail that includes bad keywords? You may have "deliverability issues ... You may be listed on one or more DNSBLs, and have "deliverability problems" as a result. Deliverability is ... read more

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SolutionBase: E-mail sender authentication: Is it the solution to spam?

Although a spammer's domain might be using SPF to authenticate, as it sends spam it will acquire a "bad rep." Blacklists are a form of ... and accreditation (DNS blacklists and whitelists, or DNSBLs ... read more


How Many Layers Does Your Email Security Need?

Sender reputation filters often miss attacks that come from newly created or spoofed email addresses, or from IP addresses with no "bad" history ... be rewritten with pointers that force them to go ... read more

Internet Governance: An Antispam Perspective

DNSBLs are the prisons of Internet email ... The abuse comes in a hundred different forms, but deep down they're all, somewhat tediously, the same: bad guys telling lies for profit. (Do you remember ... read more

Who Is Afraid of More Spams and Scams?

Security researchers who rely on data included in Web site domain name records to combat spammers and scammers will likely lose access to that information for at least six months starting at the end ... read more

'Free' VPN Hola is LITERALLY flogging access to users' devices

Go fourth and multi-Pi: Raspberry Pi 4 lands today with quad ... Brennan explained that in "using regular IPs that are not on any DNSBLs (DNS blacklists), the Hola network subverted all of our ... read more

Realtime Black-hole Lists: Heroic Spam Fighters or Crazed Vigilantes?

Those that handle lookups via DNS (DNSBLs) are the easiest to use ... Many users are in communities with limited service providers where there is no other place to go. Or the offender is so far ... read more



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