Email Servers The DNS names are:  OR You add the DNSBL by simply using the above domain names. Exim Postfix – file – smtpd_recipient_restrictions = add either OR Sendmail (new versions) in edit to: Kdnsbl dns -R A -T and add to sendmail mc – FEATURE(`dnsbl’,`’)dnl Microsoft Exchange… Read More

A Domain Name System List, also known as a DNSL, is a list of IP numbers that can be queried using the DNS protocol DNS Blacklist or DNS Block Lists (DNSBL, RBL) are usually spam blocking lists that allow an email server administrator and Internet Service Providers (ISP) to block emails from specific IP addresses… Read More

The Why There are various ways that ISP’s choose to defend their users against Spam Abuse, Scams, Phish and Abuse. Many ISP’s open your emails and read the words inside to judge whether you are allowed to receive that email or not, scanning for virus or dangerous content in an email was simply extended to… Read More