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Monthly Archive for March, 2010

Sender verification callouts

Here’s how a sender verification callout works. Let’s say I’m an innocent mail server, and some jerk is trying to send me a message. There’s a very strict procedure for how mail servers talk to each other. Here’s an example, with the sender’s (1.1.1.1) stuff in red, the receiver’s (2.2.2.2) stuff in blue, and an […]

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How do I DNS?

Buy a domain.Any registrar will do. If someone else is going to host the DNS for your domain, skip to step 4. Otherwise, continue from here. The next few steps are how you make sure the registrar knows your server exists as a nameserver. Until the registrar is aware of your server’s existence, no domains […]

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