Server :: Preventing Backscatter With Postfix?

I have Googled and searched dozens of forums and mailing list archives for a couple days now, and I haven't found a straightforward answer to what is REALLY required in a Postfix main.cf file to stop backscatter.

A couple of our servers are stil being flagged as sending backscatter. Is it possible to send a bounce message these days without it being considered backscatter?

I keep adding suggested "fixes" to my main.cf file, but Backscatterer.org still says we're doing it.

Here's my postconf -n output:

Code:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix

[Code].....