kind of replying to my own topic, I managed to sort out postfix. It was because the config I put in is invalid. Still not sure about the cryptic error message.
I need some other help though. Having trouble with FTP. I’m not able to ftp into any of the virtual servers. It hangs on after log says:
"227 Entering Passive Mode (xx,xxx,x,xx,xxx,xxx).
LIST -al"
The xxx part seems to be listing EC2 server’s internal IP, I’m not sure whether that is the expected behaviour and if not, how I can change that.