Explanation of how to Block Senders using Postfix, et al.
OK, Postfix is the main tool that I use to run my email services. The goal/hope is to be able to be low on the list of people that are hacked, unlike those that are part of the aggregation services such as gmail, outlook, and yahoo. Yahoo BTW had all their billion plus users hacked and didn't disclose that to us promptly. It would have remained hidden if it weren't for the sale. Postfix is a tool that allows you to run an email service right out of the box, but obviously there are things that must be done to make your email known to the rest of the world. If you don't let your server be known well, no mail will ever get to you. How do we let…