Sender verification callouts
Posted in Technical on Mar 5th, 2010
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 […]
