Hi, I can help you!
But need sees more logs, this:
Jan 10 19:10:02 http1 postfix/smtpd[20249]: connect from localhost[::1]
Jan 10 19:10:02 http1 postfix/smtpd[20249]: lost connection after CONNECT from localhost[::1]
Jan 10 19:10:02 http1 postfix/smtpd[20249]: disconnect from localhost[::1]
the message indicates that postfix is reachable. so that not an error.
My experience in the administration of the Linux system and web-dev (PHP, MYSQL, POSTGRESQL, CakePHP, HTML, JS, ETC.) is more than 8 years!