The last time I configured my mail server at home, 13 years ago, there was a lot of swearing and rage quitting my desk to stomp off in frustration, to eventually getting it working, not really understanding why and then carefully not touching it again.

To today where it took me about 35 minutes and not a single swear was uttered. Still using postfix and dovecot and spamassassin but this time it all just worked. Yay for me.