Aaron - 2020-11-03

I'm interested in learning Postfix in a step-by-step way . I prefer to read books when I can, but this book was published back in 2004. So, what I'm asking is if Postfix has changed so much or much at all, so that I can determine if this book would still be relevant or not. I don't know if I should make the purchase or if there are any more up-to-date books to read for learning it.

I would appreciate the support. Thank you.