Fixed the not receiving from outside... I forgot that I changed smtp in main.cf file to listen at port 465... guess what? Port 25 is still needed for mail exchange from outside world. I uncommented the smtps line in main.cf to allow port 465 connections.
Reloaded postfix and now I can receive again.
Now, if I could only get this authenctication thing figured out... I feel like I'm writing a novel here... lol